I have been trying to keep in touch with my cert guy and he has never mentioned a max-over-standard height. I hope you are wrong because mine is 300mm of lift, but there is not one bit of standard suspension left and as far as I'm concerned it is at standard height now
Back on topic, If your rig is driving like a total pig (very common for lifted trucks) fit bigger sway bars with quick disconnects. Simple solution really.
Ugly is a state of mind..... and the state of my truck!