I really don't get this... unlike later Turns T5 has at most two mechanics overlapping that you have to deal with at the same time.

Phase 1: adds
Phase 2: conflags, fireballs
Phase 3: divebombs, snakes
Phase 4: twister, dreadknights
Phase 5: liquid hell, hatch

Of all these really only Phase 2 and 4 have both things going at once. Phase 3 snakes happen between divebomb sets (and can be ignored during the second). Phase 5 hatch is eaten by the tanks and utterly negated. Contrast this to T7 Phase 4...

Voice, Shriek, Petrifaction, massive AoEs, Renaulds, venomus tail

ALL AT ONCE. T5 is the equivalent of Brayflox during leveling. It is where the training wheels come off and you need to actually play, instead of bumbling through or overpowering things.

If you can't handle T5 with Echo and i110 gear then you have ZERO reason to be in Second Coil.