I always follow such as Arnold, Albert Beckles.....old-timers high-volumes work-out.
and training EVERY muscle-group TWO-times per week.
(abs 4-5 times)
So you train in old school kind of way? Have you ever tried any HIT-type of training and what was the outcome of that if you have? Few sets, heavy loads, loads of perfect reps, special techniques like super sets, drop sets, slow negatives, giant sets?