So yeah, is it possible to make the Hesh 2's have more subwoofer-like bass?
Why not just integrate bass boost into your portable amp?
You could also build a passive shelved low pass filter.
Skullcandy has a Lifetime Warranty!!!11!
In my (limited) experience the Hesh (version1) handle abuse better than a set of Ultrasone HFI-780 that I blew up after removing the protection diodes (removing the diodes was all the rage when these were FOTM.)