Not an LCD owner but prior to getting my T50RP 50th Anni (which now does most of the heavy lifting for any bassier music) whenever I wanted to listen to my K702 over my other cans but wanted to enjoy some nice bass I would just stick a stupid +12-15dB bass shelf on there similar to yours and call it a day. It surprisingly took it like a champ.
I haven't yet tried doing the same on the planar goodness that is the T50RP 50th Anni, but I may do later today when I have a moment to listen, just for the hell of seeing what these drivers can actually handle.