Personally I'd try to get to the 15 reps total even if you have to do 4 4 4 3 or some times I was doing like 4 4 3 2 2 as long as I wasn't going to failure! That way your not decreasing volume in the final 2 or more important weeks of training. I'm going to try and keep up with my 5RM's as long as I can this time. Unfortunately I had to stop for a break last cycle because of a back injury. I've laid off the bent over rows this cycle and added one arm cable rows which have been more accommodating to my lower back.