Right now, SIGT and ETH are running neck and neck (Nvidia).
Are you on 1060?) Eth was never ever profitable on 1080, at least for the last 2 months that's for sure (I wasn't around before that).
ETH is not profitable (and has never been and will never be) on 1080 because of GDDR5X, 1060 and 1070 use classic GDDR5 which is better for ETH.