I'd be ok with a small health drop (e.g. 100 or 200) or stealth energy cost increase (e.g. -150 instead of -60), or a very small damage nerf (so it stays above 2.5k). However nerfing the damage so that it can't take out a UEF T2 mex would be too much.
Either way IMO Aeon is more deserving of a change (small boost) than cybran a nerf.