Yeah switchers are always chasing and behind the hot coin. Plus a shit ton of other people do the same switching.
I mine 1 or 2 coins zec and a shit coins at the moment and my 16x 1080tis are between 2.25 and 3.25 a card before power cost.
profit switching is a waste of time always chasing down money
what i do is have 2 rigs that are dedicated to mining shit coins (one amd one nvidia)
then all the others mine eth/zec might do some xmr soon
hoping for that one day those shit coins become something is better than chasing those pennies