diff --git a/cuburn/filters.py b/cuburn/filters.py
index 91313b9..f55bfbd 100644
--- a/cuburn/filters.py
+++ b/cuburn/filters.py
@@ -135,6 +135,12 @@ class SmearClip(Filter, ClsMod):
         tref.set_address_2d(fb.d_back, dsc, 16 * dim.astride)
         launch2('full_blur', self.mod, stream, dim,
                fb.d_side, i32(3), i32(0), texrefs=[tref])
+        tref.set_address_2d(fb.d_side, dsc, 16 * dim.astride)
+        launch2('full_blur', self.mod, stream, dim,
+               fb.d_back, i32(0), i32(0), texrefs=[tref])
+        tref.set_address_2d(fb.d_back, dsc, 16 * dim.astride)
+        launch2('full_blur', self.mod, stream, dim,
+               fb.d_side, i32(1), i32(0), texrefs=[tref])
         launch2('smearclip', self.mod, stream, dim,
                 fb.d_front, fb.d_side, f32(gam-1), lin, lingam)
 
diff --git a/cuburn/genome/specs.py b/cuburn/genome/specs.py
index d2b7c3a..7f8f9e3 100644
--- a/cuburn/genome/specs.py
+++ b/cuburn/genome/specs.py
@@ -52,7 +52,7 @@ filters = (
     , 'curve': scalespline(0.6, d='Power of filter radius with density')
     }
   , 'haloclip': {}
-  , 'smearclip': {'width': scalespline(1, d='Spatial stdev of filter')}
+  , 'smearclip': {'width': scalespline(0.7, d='Spatial stdev of filter')}
   , 'logscale': {'brightness': scalespline(4, d='Log-scale brightness')}
   })