I've been working using the Waterbury Method for the last 5 weeks. Before that, I did 8 weeks of a modified Bill Star program.
The WM suggested loads are 80% 1RM for week one, 82.5 wk2, 85 wk3 and so on. Ive been able to increase the load in this fashion up to week 5 for the prescribed back squats, lunges, chin-ups, leg curls, and calf raises. However, Ive only been able to increase my flat barbel bench and barbel curls to 85% (basically week 2 load)and dips to 87.5% (week 3 load). My decline db bench, skull crushers, bent over rows have all remained at the same load as week 1!! I can't seem to be able to add weight! Is this normal? How do I know when I should add weight? I just try to add 5lbs to each exercise each week and if I can't complete the prescribed reps with proper form I use the previous weight.