diff --git a/src/dolphin/unwrap/_unwrap_3d.py b/src/dolphin/unwrap/_unwrap_3d.py
index 26b626d4..235dbdf8 100644
--- a/src/dolphin/unwrap/_unwrap_3d.py
+++ b/src/dolphin/unwrap/_unwrap_3d.py
@@ -40,7 +40,7 @@ def unwrap_spurt(
     # Mark the "bad" pixels (good=1, bad=0, following the unwrapper mask convention)
     temp_coh_mask = temp_coh > options.temporal_coherence_threshold
     combined_mask = temp_coh_mask
-    if similarity_filename:
+    if similarity_filename and options.similarity_threshold:
         sim = io.load_gdal(similarity_filename, masked=True).filled(0)
         sim_mask = sim > options.similarity_threshold
         # A good pixel can have good similarity, or good temp. coherence
@@ -87,6 +87,8 @@ def unwrap_spurt(
         [
             "--pts-per-tile",
             str(options.tiler_settings.target_points_per_tile),
+            "--max-tiles",
+            str(options.tiler_settings.max_tiles),
         ]
     )
 
diff --git a/src/dolphin/workflows/config/_unwrap_options.py b/src/dolphin/workflows/config/_unwrap_options.py
index 677d7755..20aee94d 100644
--- a/src/dolphin/workflows/config/_unwrap_options.py
+++ b/src/dolphin/workflows/config/_unwrap_options.py
@@ -115,9 +115,11 @@ class SnaphuOptions(BaseModel, extra="forbid"):
     )
     single_tile_reoptimize: bool = Field(
         False,
-        description="If True, after unwrapping with multiple tiles, an additional"
-        " post-processing unwrapping step is performed to re-optimize the unwrapped"
-        " phase using a single tile",
+        description=(
+            "If True, after unwrapping with multiple tiles, an additional"
+            " post-processing unwrapping step is performed to re-optimize the unwrapped"
+            " phase using a single tile"
+        ),
     )
 
     _to_tuple = field_validator("ntiles", "tile_overlap", mode="before")(to_tuple)
@@ -249,14 +251,18 @@ class SpurtOptions(BaseModel, extra="forbid"):
     """
 
     temporal_coherence_threshold: float = Field(
-        0.6,
-        description="Temporal coherence to pick pixels used on an irregular grid",
+        0.7,
+        description="Temporal coherence to pick pixels used on an irregular grid.",
         ge=0.0,
         lt=1.0,
     )
     similarity_threshold: float = Field(
         0.5,
-        description="Similarity to pick pixels used on an irregular grid",
+        description=(
+            "Similarity to pick pixels used on an irregular grid. Any pixel with"
+            " similarity above `similarity_threshold` *or* above the temporal coherence"
+            " threshold is chosen."
+        ),
         ge=0.0,
         lt=1.0,
     )