3 Charges of addersgall per minute is plenty, not to emntion only about half of Sage's oGCD Heals actually need it. And you probbaly want to actually use at least 1 stack of addersgall every 20s, to keep the cd on gaining them rolling, which means regianign 7% of your MP every 20s at the minimum.

Also even in AoE situations isn't toxikon a los over Dyskrasia, as you get 2 dyskraisa's of for every 1 toxikon you could get? Seeing as toxikon does 240 for the first enemy and then 120 compared to dyskrasia's 160 to, all so 320 potency over two gcds [It is a bit better with the IIs, but Toxikon 2 is still 330 potency with a 50% dropf off compared to the 340 with no dorp of from 2 dyskrasias]