here are a few
1. add 5lbs a week to your bench a week. If you're benching 250 the next week go to 255, then to 260 the wek after.
2. stop with the 10/8/6/4. Pick a weight you are going to do with 3 to 5 sets and stick with that weight.
3. Don't burn your self out warming up. Do 4 to six warm up sets with out going over 5 reps each. So if you bench 250lbs , do 135 for 5, 155 for 5, 185 for 3, 200 for 3, 225 for 1, then go to 250 and do it as many times as you can. Give your self a few minutes rest between you last warm up set and your first work set.
4. Lift the weight as explosive as you can on both the concentrick and eccentric portions.
Read dave tates article on benching 600 lbs and the 1 to 6 princable by poliquin is good too.