It is a difficult balance for sure... Maybe it's ok as it is now. Dunno.
As an addendum, today I thought of something and tried a different approach. I used the "defensive" super to tank the poison dmg while making lots of attacks and casts to kill the poison enemies. It worked a bit. It's not the best strat, but it's an option I did not think about before.
I still lost at the third loop, but that's for other reasons, lol.
Maybe I just have to try more stuff and combinations. I probably complained too soon, sorry about that. I'm not having the best of days and maybe I commented my frustrations away here, which was uncalled for.
Thanks for everything, have a nice day Jay.