[xmonad] HiDPI, xmonad and PyCharm

Does any of you have a solution for using PyCharm/IntelliJ or other JetBrians programs with xmonad and HiDPI displays. I have a resolution of 2880x1800 and text and icons are totally unreadable. In Gnome 3.1x it is better and I am not sure why. I have tried to start java with java options having -Dis.hidpi=true, but with no success :/ Does anybody here have experience with such a setup or an idea how to approach the problem? Any ideas are welcome, even the long shots :) -- brunsgaard