I would say every power lifter I have known who did well had Bench as their weakness. There are a number of systems in place to make the press easier but it's still horrible.
Sorry if this is already known, but if there is one bit new it could help. I have a pathetic bench and this was the system I used to get the best I could, long limbs are not a power-lifters friend.
Start position. High arched back, feet planted, legs and hips pulled taught, arms straight ahead of your shoulders or slightly lower down your body, never above, shoulders as relaxed as possible, wide grip.
Get a spotter to load the bar to you, not you reach for the bar, impossible to be used to if training alone. The position to be in really cannot be attained as effectively with the bar in your hands and you would be red-lighted for even trying it in competition.
The down should reach the highest point on your chest, as in furthest from bench not closest to neck, in a smooth curved motion, gradually releasing some tension from your legs as you go, bar control is supper body, stability of body is legs.
Pause at bottom of the movement, holding the bar touching, not resting on the chest, relax the hips and legs as much as practical. Elbows may be a bit further up the body than the bar, if they are do not correct.
Push off. Slight tension with the legs, bring elbows under the bar and drive with your upper body.
Sticking point. Know where yours is, as you approach it fully engage the hips and legs to give you drive through this weak spot.
Finish. Once through this point the legs become stabilisers again to ensure you are holding the bar at full arms length and stable. Some judges will allow a little instability during but none will at the end. Hold until told or spotters take the bar.
There are various bits of advice on the best bench form and technique. this one worked for me because I have long gangly arms and legs, great for running and climbing, and a liablity in power events. The breakdown by section helped because each became prep for the next part and I can use everything to overcome my genetics.
Training wise there are many systems for powerlifting and all of them are good. I am doing a version of one at the moment, badly due to time constraints.
555s five exercises five sets five reps. One weight per exercise, if too easy increase it and don't reduce. Long rests are essential and you should be as fresh on the last set of the session as possible. Very long sessions.
Pyramids. Virtually what you are doing reps usually run 12-10, 10-8, 6-4, 4-2, 2-1 then back up the reps but usually only a couple of sets going up. Never repeating rep quantity in either direction, rep max only as dropping weights and from 6 or below, above and on the way back up should be more comfortable but still hard. Failure is always an option as the mythbusters say.
Simple sets 3x6 reps per exercise. Number of exercises undefined. The idea is to use 6RM each time, this uses fatigue to make the weight feel heavier each set. So set 1 feels hard, 2 feels barely possible and 3 requires some assistance or can result in failure on 6. If all three are done without assistance weights go up next session.
Drop sets. I do like these. Start with bar loaded with small denominations loaded to your 1RM, lift it, try for a second if comfortable, stop if not, take weight off, do as many as you can, likely 1 or 2, and keep going until you run out of small weights and energy. On bench I normally finish with 30 or 40Kg, squats and deadlifts 60Kg, start weight sometimes doesn't move, but will use masse of energy even so.
There are many others those are just a few.