If you don't keep very strict form straight bar bench will tear up anyone's shoulders. When I was having trouble with my shoulders I switched to dumbbells and it helped alot. Also, give reverse grip bench a try. It takes alot of the stress off your triceps and shoulders and places more on the pecs.
If you don't have a bar like that you can either do dumbbell press or do a reverse grip flat bar bench. On the reverse grip you have to drop the weight way back. I would start with less than half what you do on normal bench just to get the feel for it.
That grip works the chest more that the front delts. Kind of mimics dumbbell press. Also it's incline which is always less weight than flat or decline. But he has to be on the front or end of a pyramid because that isn't a lot of weight at all for someone of his build
We were actually driving back from NC to Dallas that day and got stuck in the traffic jam that occurred from this. We were stuck at the Georgia/Alabama line on 20 for almost an hour and finally got up to the scene where there was a black Durango that had been drug to the side of the road with all the windows smashed out.