you should stick with the program. Don't simply up your TM just because you're hitting the last set for a ton of reps - this will not last forever. If you are benching at 400 pounds for 20 reps, please tell us your secrets... that sort of thing. Not sure how much you weigh or what total weight you're doing overhead presses for 18 reps, but again, most guys are not even hitting singles for 200 pounds, so that 18 reps you're doing now will not last forever. You could joker set if you like after the PR set. So if you are pressing 100 pounds for 18 reps on the last set, then do 110 x5, 120 x5, 130 x5 and keep going until you don't think you can do another set for 5 reps. NEVER miss a rep.
As for training days - what exercise is the hardest to recover from? Do you get really sore after Squats or deads? Or does OHP and bench torch your shoulders? That's how I plan my week. Squats seem to take the most toll on my schedule. I do not tailor my training around what other people are doing because that is simply not conducive to my goals. I know it's fun to work out with buddies on bench day, but I don't go to the gym to make friends or be a social butterfly, I go there to get work done and get the fuck out. Because it's hardest for me to recover from squats, I isolate them on Saturday, with a full day of rest on Friday and do conditioning on Sunday.
My split is like this:
Tuesday Dead Lift
This works for me, but may not work for you. You could bench on Monday with the other 99% of the world... but I prefer Thursday's because that day I have my choice between 4 empty benches. On Monday every bro and their single-day-a-week training buddy wants to "get back into lifting" after doing pint size curls all weekend long.
Ask yourself, is the program working for you? Are you making progress? If so, why change it now?
Until you can no longer hit the prescribed reps in a set should you change things. If anything, wait until you stall and then set your TM 10% lighter, but never take your current TM and up it by more than 2.5/5 kilos - that defeats the principle of "progress slow." I even have a set of 1/4, 1/2, 3/4 and 1 pound plates that I use for my overhead pressing so I can progress even slower since stalling at a 210 TM, but continue to "set PRs" by doing 1 rep at 210.5, and will next cycle surely do 1 rep at 211, etc...
As far as the Beyond Book - get it. Worth every penny and I'd pay more for it if the price was higher; but as the saying goes, if it's not broken, don't fix it. Stick with what you're successful at now, until you are no longer successful, then look for ways to improve your training.