Oh man, so many variables here it's hard to choose a place to start.
Okay, I've chosen one. Start by reading this: http://www.bikeroar.com/tips/understanding-bicycle-tire-pressure.
Advice for you:
- Don't exceed listed tire pressure for your tires or the rim. Yes, rims have max. tire pressure.
- Consider how your weight contributes to tire pressure. It adds to it. So allow yourself a 5-10% buffer.
- Try running 5psi lower pressure each ride until you find a balance of comfort to risk (of pinch flats or feel). You should find lower pressure more comfortable.
- Consider riding wider tires. They allow you to run a lower pressure and feel nice.