54 GH at difficulty 19970091.25813 is 1.36 BTC/day after the halving. $16.32/day at $12.

I suspect your calculator is in need of repair.

Your power figure is 22% of the income— and thats a "soon" rate, e.g. the rate after the hardware which is already ordered and paid for is turned on. And what happens when the difficulty has cranked to 100x on second gen mining asics?