diff --git a/djangorota/rota/forms.py b/djangorota/rota/forms.py
index 146234c..b3e4424 100644
--- a/djangorota/rota/forms.py
+++ b/djangorota/rota/forms.py
@@ -397,8 +397,8 @@ class RotaScheduleForm(forms.ModelForm):
         # legacy builder args (the remaining keys in `options` are treated as
         # constraint configuration for `RotaConstraintOptions`).
         builder_args = {
-            "balance_offset_modifier": {"type": "int", "default": 1, "help": "Balance offset modifier used by the builder"},
-            "ltft_balance_offset": {"type": "int", "default": 1, "help": "LTFT balance offset used by the builder"},
+            "balance_offset_modifier": {"type": "float", "default": 1.0, "help": "Balance offset modifier used by the builder"},
+            "ltft_balance_offset": {"type": "float", "default": 1.0, "help": "LTFT balance offset used by the builder"},
             "use_previous_shifts": {"type": "bool", "default": False, "help": "Use previous shifts when building the rota"},
             "use_shift_balance_extra": {"type": "bool", "default": False, "help": "Enable extra shift-balance penalties"},
             "use_bank_holiday_extra": {"type": "bool", "default": False, "help": "Apply bank-holiday balancing extras"},
@@ -412,6 +412,8 @@ class RotaScheduleForm(forms.ModelForm):
                 self.fields[field_name] = forms.BooleanField(required=False, initial=bool(initial), label=k.replace("_", " "), help_text=meta.get("help"))
             elif meta["type"] == "int":
                 self.fields[field_name] = forms.IntegerField(required=False, initial=initial, label=k.replace("_", " "), help_text=meta.get("help"))
+            elif meta["type"] == "float":
+                self.fields[field_name] = forms.FloatField(required=False, initial=initial, label=k.replace("_", " "), help_text=meta.get("help"))
             else:
                 self.fields[field_name] = forms.CharField(required=False, initial=initial, label=k.replace("_", " "), help_text=meta.get("help"))
 
diff --git a/gen_proc.py b/gen_proc.py
index 2a82003..c829dbb 100644
--- a/gen_proc.py
+++ b/gen_proc.py
@@ -50,7 +50,7 @@ def main(
     ratio: float = 0.001,
     start_date: datetime.datetime = "2026-03-02",
     weeks: int = 26,
-    bom: int = 2,
+    bom: float = 1.5,
 ):
     rota_start_date = start_date.date()
     suspend_on_finish = suspend
@@ -59,17 +59,18 @@ def main(
         rota_start_date,
         weeks_to_rota=weeks,
         balance_offset_modifier=bom,
-        name="proc_rota",
+        name="proc_rota1",
     )
     # Rota = RotaBuilder(start_date, weeks_to_rota=20, balance_offset_modifier=1)
     Rota.constraint_options["balance_shifts"] = False
     Rota.constraint_options["balance_shifts_quadratic"] = True
     Rota.constraint_options["balance_weekends"] = True
-    Rota.constraint_options["max_night_frequency"] = 3  # 3
+    Rota.constraint_options["max_night_frequency"] = 4  # 3
     Rota.constraint_options["max_night_frequency_week_exclusions"] = []
-    Rota.constraint_options["max_weekend_frequency"] = 2
+    Rota.constraint_options["max_weekend_frequency"] = 3
     Rota.constraint_options["hard_constrain_pair_separation"] = True
-    # Rota.constraint_options["avoid_st2_first_month"] = True
+
+    Rota.constraint_options["max_days_per_week_block"] = [(5, 2), (6, 3), (8,4)]
 
     #wr = [
     #    WorkerRequirement(
@@ -93,7 +94,7 @@ def main(
             name="exeter_twilight",
             length=12.5,
             days=days[:5],
-            balance_offset=4,
+            balance_offset=2,
             constraints=[MaxShiftsPerWeekConstraint(max_shifts=2)],
         ),
         SingleShift(
@@ -115,7 +116,7 @@ def main(
             name="torbay_twilight",
             length=12.5,
             days=days[:4],
-            balance_offset=4,
+            balance_offset=2,
             assign_as_block=True,
         ),
         SingleShift(
@@ -128,7 +129,7 @@ def main(
             name="plymouth_twilight",
             length=12.5,
             days=days[:5],
-            balance_offset=4,
+            balance_offset=2,
             workers_required=1,
             constraints=[MaxShiftsPerWeekConstraint(max_shifts=2)],
         ),
@@ -143,7 +144,7 @@ def main(
             name="weekend_exeter",
             length=12.5,
             days=days[5:],
-            balance_offset=3,
+            balance_offset=2,
             rota_on_nwds=True,
             force_as_block=True,
             constraints=[PostShiftConstraint(days=2), PreShiftConstraint(days=2)],
@@ -172,7 +173,7 @@ def main(
             name="weekend_torbay",
             length=12.5,
             days=days[4:],
-            balance_offset=3,
+            balance_offset=2,
             rota_on_nwds=True,
             force_as_block=True,
             constraints=[PreShiftConstraint(days=2), PostShiftConstraint(days=2)],
diff --git a/rota_generator/shifts.py b/rota_generator/shifts.py
index fe1a1d5..966fafc 100644
--- a/rota_generator/shifts.py
+++ b/rota_generator/shifts.py
@@ -610,7 +610,7 @@ class RotaBuilder(object):
         self,
         start_date: datetime.date = datetime.date.today(),
         weeks_to_rota: int = 26,
-        balance_offset_modifier: int = 1,
+        balance_offset_modifier: float = 1.0,
         ltft_balance_offset: int = 1,
         use_previous_shifts: bool = False,
         use_shift_balance_extra: bool = False,