Variations on a theme.
There are a few ways to handle this issue. You could not change the program movements, and instead work in more reps per set. More reps means more strength. This may mean that you actually may need to lower your weights a bit to make this run, just as you have already done. This works a lot of the time.
Since you have reset, I might would try a slightly different approach.
Take your bench movement as the goal to improve.
Work around the movement instead of direct hits. Work overhead pressing the hardest. Move close grip in as your main bench movement. Do lots of medium grip chins, and do pushups. This will give you a chance to strengthen the links before you come back to the main chain.