65psi sounds like the ballpark for a 155 pound rider. make sure you consider all your riding gear, shoes, water, helmet, all that.

or better yet, put all that stuff on and check the sag, then adjust air pressure as desired. also realize that many suspension pumps lose a little air when you connect & disconnect the hose, so shoot a bit high if necessary and ALWAYS re-check sag after you've pumped. don't assume that it is right without measuring the sag after any pressure adjustment.

~15% sag = best pedaling performance, worst small bump compliance, best bottom-out protection (if you jump)
~35% sag = opposite of low sag.


regarding your fork staying down a bit, check the rebound knob. experiment with it all the way in or out. if it's all the way firm, it is very normal for the fork to slowly return. since you are running low pressure, you may need to back out the factory setting a bit.

I generally set my suspension to rebound fairly slowly, but not slow enough to pack up in sustained bumps like a rock garden, series of roots, etc. you can easily test this by riding down a set of stairs.