I am approaching 14k and my fronts are starting to look low, but only in the middle.

I know I have been wary of cornering too hard because of wear and tear. I also know that I have been accelerating hard only when the steering is pretty much straight.

I have SportMaxx 225/45/17's running about 36Psi because I regularly hit 90ish.

Any advise as to why it's just the centres? or what to go for next and what Psi's people use for similar sized tyres.

Thanks in advance