diff --git a/simpeg_drivers/components/factories/misfit_factory.py b/simpeg_drivers/components/factories/misfit_factory.py
index 0b7c8d59..0930af60 100644
--- a/simpeg_drivers/components/factories/misfit_factory.py
+++ b/simpeg_drivers/components/factories/misfit_factory.py
@@ -16,9 +16,10 @@
 from typing import TYPE_CHECKING
 
 import numpy as np
-from dask.distributed import wait
+from dask.distributed import Future, wait
 from simpeg import objective_function
 from simpeg.dask import objective_function as dask_objective_function
+from simpeg.electromagnetics.base_1d import BaseEM1DSimulation
 from simpeg.objective_function import ComboObjectiveFunction
 
 from simpeg_drivers.components.factories.simpeg_factory import SimPEGFactory
@@ -56,7 +57,7 @@ def assemble_arguments(  # pylint: disable=arguments-differ
         else:
             channels = [None]
 
-        use_futures = self.client
+        use_futures = self.client and isinstance(self.simulation, BaseEM1DSimulation)
 
         # Pickle the simulation to the temporary file
         with open(
@@ -143,12 +144,12 @@ def collect_ordering_from_misfits(self, misfits):
         """
         attributes = []
         for misfit in misfits:
-            if self.client:
+            if isinstance(misfit, Future):
                 attributes.append(self.client.submit(_get_ordering, misfit))
             else:
                 attributes += _get_ordering(misfit)
 
-        if self.client:
+        if isinstance(attributes[0], Future):
             ordering = []
             for future in self.client.gather(attributes):
                 ordering += future
diff --git a/simpeg_drivers/components/models.py b/simpeg_drivers/components/models.py
index be91a6f4..0650807e 100644
--- a/simpeg_drivers/components/models.py
+++ b/simpeg_drivers/components/models.py
@@ -276,9 +276,9 @@ def lower_bound(self) -> np.ndarray | None:
             bound_model = -self._upper_bound.model
 
         if bound_model is None:
-            return -np.inf
-
-        lbound = bound_model.copy()
+            lbound = np.full(self.n_active, -np.inf)
+        else:
+            lbound = bound_model.copy()
 
         if self.is_sigma:
             is_finite = np.isfinite(lbound)
@@ -304,9 +304,9 @@ def upper_bound(self) -> np.ndarray | None:
             bound_model = self._upper_bound.model
 
         if bound_model is None:
-            return np.inf
-
-        ubound = bound_model.copy()
+            ubound = np.full(self.n_active, np.inf)
+        else:
+            ubound = bound_model.copy()
 
         if self.is_sigma:
             is_finite = np.isfinite(ubound)
diff --git a/simpeg_drivers/utils/regularization.py b/simpeg_drivers/utils/regularization.py
index 506b30c8..5d06a3ef 100644
--- a/simpeg_drivers/utils/regularization.py
+++ b/simpeg_drivers/utils/regularization.py
@@ -510,9 +510,13 @@ def set_rotated_operators(
     )
 
     grad_op_active = mesh.Pac.T @ (unit_grad_op @ mesh.Pac)
+
+    # Remove extra partial volume from missing neighbors
+    row_sum = np.asarray(grad_op_active.sum(axis=1)).ravel()
+    grad_op_active -= sdiag(row_sum)
+
     vol_avg_op = mesh.Pac.T @ (vol_avg_op @ mesh.Pac)
-    active_faces = np.isclose(grad_op_active @ np.ones(mesh.n_cells), 0)
-    active_faces &= grad_op_active.max(axis=1).toarray().ravel() != 0
+    active_faces = grad_op_active.max(axis=1).toarray().ravel() != 0
 
     vol_avg_op = vol_avg_op[active_faces, :]
     vol_avg_op = sdiag(np.asarray(vol_avg_op.sum(axis=1)).ravel() ** -1) @ vol_avg_op