Well, have you thought about how much sense it really makes to have a 5x5 bench day and a DE bench day and yet never use any real maximal lifting? I know that Rip recommends DE work can be put in but for the life of me I can't figure out how the DE work is really going to help you get reps on 5x5. At the same time can't see how volume oriented work is going to contribute to you explosivitey for the DE
In other words you've got two different goals at work, imo. One is "getting reps" which is, imo, not as important as intensity when it comes to strength. Then you're doing DE work which is supposed to work on explosiveness and I take it it is in the strength-speed realm. So that is to help with absolute strength...which you are not really working efficiently with 5 sets of 5.
Sooo....I would think about whether your goal is to get stronger on bench or to get reps on bench and go from there
That is to say that there comes a point when just getting the volume is just not going to have so much value as it once did from a max strength perspective.