i'd use clustering instead of supersetting. so you lift a weight for say 8 reps and this should be close to but not at failure, you then set the weight down for 20 seconds pick it up and lift as many reps as you can, set it down for 20 seconds, pick it back up lift etc.
it might go something like 8 reps, 3, 2, 2
the advantage is that the first 8 reps should come close to activating all the muscle fibres if its close to failure, the short rest means that when you then lift again your exposing all the muscle fibres to the weight. in conventional 3 x 8 formats by the time you lift again after rsting 2-3 mins you have to go through the process of activating the muscle fibres again. look up DC training (although it suggests going to full failure, i find this incredibly hard on the CNS, i prefer going to 1 just before failure) or myo reps. i actually do a sort of hybrid of this and conventional lifting so will do
1 activation set, 2 mini sets then rest a full 3 minutes and do 1 activation set, 2 mini sets and then rest a full 3 minutes and do 1 activation set, 2 mini
so it might go 8,3,2 rest 3 mins 6,2,2 rest 3 mins 5,2,1
