If it’s a short term issue (6 months), then improving form alone can probably up you 30-40 pounds in the bench in a short period of time.
I trained a HS powerlifter with similar numbers (335 bench, 450 dead, 495 squat), Although he was 6-4, 270 with long arms. He was an “elbows out” bench presser and had never worked on taking his grip out to the max. I’m 5-8 and I bench at the absolute limit width (index on the rings). You should too. With form improvement, he hit 370 just by practicing with 225 for perfect (tight) singles for a week. Then with a bench shirt he hit 435 all in a matter of about 3 weeks.
Find Dave Tate’s bench press form article (I think it’s "12 steps…). This guy I mentioned didn’t even have time to incorporate speed bench training, bands, or lockout work or I’m sure he would have had 485, probably could have moved up to a tighter shirt and hit 500+ in a year. I’ll give him a call and see how its going.