One other thing. You don't need back off sets on wednesday of any kind. It won't hurt you as long as you keep it nice and light like that but I doubt with the kind of weight it represents a back off set will make a big difference.
Wednesday has an incredible effect of Friday. Never make the mistake of thinking that a little more volume won't hurt as long as the weights are really light

.
I was looking throught my logbook and saw this place where I was running this program (not exactly but essentially the same) and for some unknown reason I had got into this habit of doing 5 sets of squats on Wednesday. It was like a prolonged brain fart

. The thing is I had been getting nowhere on Friday.
I had two options. Either Monday wasn't enough or Wednesday was too much. Of course I dropped the squats on Wednesday to 3 sets (and sometimes 2) and Friday picked up again. But keep in mind the 5 sets FELT like nothing much.