On your 750 the rear 190 will fit without any rubbing problems. Unless your racing your bike, on the street you won't notice a major handling difference. Actually, a few guys I ride with like the 190 for street riding better. Try it out for yourself.
personally with installing it on the that wheel, i believe it will crown more, so it will drop in faster and might throw you off. if you like to corner hard i think it will be worse. i was considering it, but i think i will pass on it