Exacerbating back injury with heavy bench press?

I hurt my back a little while ago doing deadlift, and so I decided to stop with my deadz, squats, cleans, and kettlebell swings until there was no more pain.

I decided to take this as an opportunity to work on my bench press strength, and have been seeing steady gains.

I have pretty solid form with my bench, IMHO. I do a bodybuilder style, as opposed to powerlifting (bar to nipples, ass on the bench). I've gotten good at clenching my whole body for the bench, including my lower back.

I did 2 reps at 285lbs today, and my back was in pain by the end. Is this delaying my back recovery? Should I be staying away from heavy benching until I'm recovered? Is this an indication of bad form (maybe I'm not clenching my abs tight enough?)?

Has anybody had this type of problem before or have any insight?