im curious , why do you guys factor energy drain only on sch rotation and not on smn rotation

i usually put all dots on target (bio,bio II,Miasma,Miasma II,Thunder), then pop a fester, then right after i pop an energy drain. now i got some DL accesories, an HQ 4 melded(+12 crit + 4 determination) i55 book and fester +energy drain combo hit around 1k. if i get greedy and i double energy drain and lest say all crit, i could hit for 1.4k.

am i doing it wrong? should i not use energy drain as SMN?