Post an example day you have planned for one of the upper body days. In your top post you mentioned 5x5 but are wanting to do tricep isolation lifts? Here are a few minor things I did which are not in the book and might prevent asking too many questions.
BBB - Depending on how I felt, one week I would do 5x10 then another week just 3 sets of the same weight, 10/10/12-15 reps. If I got 15 reps bump up the weight and do the 5x10 next time.
Isolation - Do 1 upper body day by the book, on the other day instead of your last BBB lift swap it out for 2 isolation lifts, tricep ext/curls or whatever, super set if you want.
Main lift - If you want to get in some more reps, after the main AMRAP set, -10% and do the 3-5 reps, then -10% again and do another AMRAP set.