I am a very large rider (300 lbs +). I have my tires pumped up to the max (60 PSI) and they still look a little pancakey to me when Im on the bike. Im looking for recommendations for the highest PSI tire I can get in the 26" size. The wider the better. I have searched around on Google for a couple hours and cant seem to find a slick or semi slick rated over 65 PSI. Thanks for any help!