Hey bro
I train them separately...
I do biceps with leg
3 * 12 reverse biceps barbell curl
3* 10 alternate db curls
last exercise (fst-7 ) 12 reps each set with 30sec rest
Preacher db curl....
I do triceps with chest
Bar dips with weight 3*10
Close grip db 3*12
Rope triceps push down(fst-7)
12 reps each set with 30sec rest
your problem is you are doing little work for them, reverse curl is not even a bicep exercise, its more for forearmes and the muscle between bicep and tricep.. 10 sets is not enough to grow you need 30 sets for bicep and 40 sets for tricep twice a week changing the rep range on each week, one day is heavy 6-8 reps with pump at the end of workout and the other is 1/4 heavy and the rest for pumps 15-20 reps.. fst 7 is good but i go more like fst 15..
For bicep standing bar curl and preacher straight barbell curl is the best for full muscle growth, preacher is actually the best exercise for bicep it hits the bicep in a very unique way so i put it at my furst exercise and go heavy for 6-10 reps.. For tricep to get the meat hanging low when relaxed over head dumbell extension is the best it stretch the muscle to its fullest and when the arms are relaxed it looks massive..
If your arms are lagging behind you must do them together to get the full benefit with a high volume of work, twice a week is a MUST for maximum growth..