well I can't explain -because I can't find any demonstrable differences in fussing with LE and trailing edges on these little flat plates.
these are NOT gliders - they are models which fly over a wide range of attitude and speed so I really can't see how some minute shift in leading edge thickness, roundness, etc., could make a difference - I rounded some - simply--- nothing appeared different in flight - -
From your past work -I can see that you feel the improvements there must pass on down - I simply can't find that these make any differences at these sizes and under these flying parameters.