Tom R
I flipped these tips to try to gain a little speed, it worked. I have two forms that I use one is just a 2X4 that has about a 15" radius just use it for a little reflex the one I use most is about an 10" radius made out of 5 pieces of masonite siding screwed together.
I'm not sure what you mean by the handles, if you mean the tips I think you could sure flip them some, the main thing it will do is add more weight at brace height which means more cast. If you have too much set in the bow I'm not sure it will do a whole lot. it migjt already be overstressed and in that case might be detrimental to the bow. these are all just my opinion, I don't have but twenty or so bows under my belt.
Mark