First, thanks to Jim for 5-3-1 and beyond 5-3-1, both are excellent books. I've been around weights on & off for many years (I'm 45 now), but I don't think I have ever followed a percentage-based program - it was always been "if you can complete X number of sets, then its time to add weight".
I jumped in to the "BBB, Variation 1" template - I'm only in the 2nd week, but I find they way the program makes me push myself is very refreshing.
This template requires, basically, that the 5x10 sets be done with the first-set weight, instead of the 50% weight. Week 1, on press day, the 5x10's were difficult, and week 2, I had to break it up (10,10,8,8,8,6, to get 50 reps). Worried about what week 3 will be like.
I don't feel the weight is to heavy, the 3's were easy, with 8 on the AMRAP set followed by 4 reps joker at +10%.
1) is it normal that one muscle group would not be able to perform as well as others in the 5x10 part of the template, even though the strength/work sets were fine?
2) is it a good idea to follow the 'rule of 50' when I can't get the true 5x10? or just stop at 5 sets?
3) do I need to decrease weight when 'failing' the 5x10's, or only when missing 5-3-1 sets?