I personally love the Chest/bi and Back/tri grouping. I find that doing the opposite on these days allows me to really hammer my arms as I didn't exhaust them from the chest or back exercises. Plus I really enjoy the pump!!

your set/reps scheme seems alright, keep it fairly low and heavy. But at the ned of the day it comes down to how your body respondes to the training. For me the heavy, 8-10 rep work works great for me!