Honestly im not far that either. I finished fiery oasis not that long ago too so i think you can handle this easily since my team is only at lvl ~30. I could beat more stages but im to lazy for that. Honestly i dnt use witches and mages a lot cuz they dnt makes to much damage for me and they die way to fast.
Btw: How the hell has everyone Level 80+ xD I still stuck at Level 63 (i got level up yesterday) after 2 years O.o