Weight gain will help. But also..........I would be doing a higher volume of sets that are 5 reps or more, and you might choose to increase bench frequency. I would drop the DB Benches for 5x10. I don't think you are at a point where this is gonna help much. 531 program doesn't work for a lot because of the low volume of actual strength work.
I'd rather see you doing something like 3-5x5 on Tuesday and then 3 singles across on a Friday. I think doing that, you get yourself up to 225.