The rotation I've found thanks to fellow members here that worked the greatest with the greatest opening burst DPS (720 dps burst with a crit Fester) was

Raging Strikes > Poison Pot (either here or after one of the first 3 spells) > Bio 2 > Miasma > Bio > Fester > Miasma 2 > Contagion, Swiftcast Shadowflare > Ruin 2 > Rouse > Ruin 2 > Spur > Fester > Enkindle > Ruin > Ruin > Ruin 2 > Fester >Aetherflow > reapply Bio etc...