Quote - Markschum has caught the problem.

If you're only going to set the value at keyframes, you don't need the
outer loop on range(scene.NumFrames()).  The while loop based
on NextKeyFrame will do the whole job.

This would do well enough in each case:

for parmName in copyParms2:
..... parmTo4 = leftthighTo.Parameter(parmName)
..... parmTo5 = leftbuttockTo.Parameter(parmName)
..... parmTo6 = lefthipTo.Parameter(parmName)
......scene.SetFrame(0)
......while 1:
....... parmTo4.SetValue(leftthighFrom.Parameter("Bend").Value() * -0.01)
....... parmTo5.SetValue(leftthighFrom.Parameter("Bend").Value() * -0.01)
....... parmTo6.SetValue(leftthighFrom.Parameter("Bend").Value() * -0.01)
....... nextKey = parmFrom.NextKeyFrame()
....... if (nextKey == None):
............ break
....... scene.SetFrame(nextKey)

Sorry for the delayed expression of thanks, but I just got back from a road trip.  So... THANKS!  I'll try this improved code!  cheers...