K702 owner here. Also had a problem with harsh, even painful highs. One thing I tried is changing donut-shaped foam into glorious toilet paper mod to cut a bit of the highs, and then try to EQ it. Now i have different pads on (YIVO velour): harshness is gone, bass is boosted but not too much (i don't eq them anymore) they are more soft and comfy on my head. So I would try that.

EDIT: I think that even after eq stock k702 is a bit harsh.