Your overall numbers seem pretty good in my opinion, I think 5-10lb progression on top of those is nothing to be ashamed of. Its not like you started out benching only 150 so you can't expect to be adding 20+ lbs every loading phase.
Also any cure for a struggling grip on deadlifts...haven't tried using straps yet.
Your probably at the point where your grip is going to be giving out faster than your body is. Really only a couple of suggestions, do some grip strengthening exercises, use some chalk, or buy a pair of straps. My grip goes out before my body on deads also and I had to start looking to straps to help me finish them at around the same weight for 5x5's.