If the hide controls dial doesn't work (which controls the animated properties of the visibility, as in the visible from Properties or Hierarchy, not sure, as in don't know, if or how that property would relate to collisions in regard to sims) you can try this...

Float Controls INJ

Download the zip and put the 3 files together in any pose folder in your library. It's a pmd inject. When applied to LF Pro (1) it "translates" all of the control chips in the Y direction...

At full strength (1) it translates the polys quite a bit...

The dial can be found in the Controls Section of LF's Body...

Note this is not a true transform but rather a morph: that is, the polys vertice coordinates are altered but the centers/origins in Poser terms are not. In any case it gets those poly vertices out of the way, which I think would be the quality related to collision calculation.