ABS warping bad, first time printing.

[AlwaysBanned]

ive been printing with PLA for several months now and wanted to try my hand at ABS and so far no such luck. Ive only tried the one item and tried it 3 ways, no brim - bad. Brim at 7mm was meh, then a raft at stock settings and this one actually warped the worse, it actually broke free from the raft. I printed at 240c and bed at 110c with a mylar blanket over the top to keep ambient temp up as well (which worked well). I know my bed is level. I am printing on blue painters tape over glass bed which is sticking just fine. The final product is stuck well and has to cool completely to be removed. Is there something else I could be doing to prevent the corners from warping? Thank you.