Help choosing DR sizes.

[KLAB]

I'm thinking about either getting another pair of 255 50 16 Mickey Thompson ET Streets. However I have a pair of 17" SS wheels that I would love to paint to match my other wheels and put 275 40 17 MT ET Streets so the car always looks the same (sleeper stats). My question is this:

I know the 275's on the 17's would be wider, but would the shorter sidewall be too stiff and maybe have less traction? I'm trying to weigh the pro's/cons, the 275s would be more expensive but would be real awesome to have matching wheels all the time. I hook very well with the 255's on salad shooters right now.