All geosets disappear at the end of decay bone animation already. Ctr click it "in magos" or zoom in if you are unsure. The gutz are from the sorceress mdl, you will probably see the same white´ish gunk there. If you are referring to something else, I don´t see it.
The current version is already optimized. Deleting key frames with the same´ish values causes geoset visibility issues, only half of those issues are easily fixable, the other half is a "wtf is happening" type of issue.