I put this in another post about bi workouts, it put 1" on my bi's in my last cycle.
1. Straight bar curls- 2 warm up sets,10,8,6,4
2. Preacher curls-10,8,6,4 place chin on bench curl bar behind head and squeeze
3. Standing hammer curls 10,8,6,4
I usually end with superman curls on the cables but you can try seated curls on an incline bench.
Sets should be heavy with good form. All reps should be quick on the up but 4-5 seconds on the negative. At the top of the rep you have to really squeeze the shit out of the muscle. Good luck
PS. I never liked the back bi, chest tri, combo. It seems like it's doing twice the amount of sets for the smaller muscle. You wouldn't do 24 sets of chest or back, why do it for bi's and tri's?