If your electricity cost is 19 cents per kWh than simple don't dream about mining by s7, all previous miners which you wroted are useless now even with free electricity. If you can buy antminer s9 but with such high electricity prise, it's still not profitable. It will be better to try altcoin mining with GPU or there are some altcoin miners, I can't remember their names.
You have a point bitcoin mining is not profitable nowadays no matter how cheap your electricity is and lets also consider the mining difficulty on bitcoin which is already high thats the most reason that most miners having a difficulty on achieving roi.As you suggested i will rather choose altcoin mining because we could always exchange it to bitcoin and mining difficulty isnt that high.