I probably should have said charactaristic. It's just part of delta wing flying.

And depending on the overall airfoil and other things yes a sharp leading edge may help with a delta. Especially if you found on previous deltas that you had a non stable low speed sort of pumping going on where the model would not stay in a stable mode of flight. It's the sort of thing that would benifit from a lower powered quickie build test version.