Damn it, lost a day of troubleshooting. After the whole NiceHash thing I started mining other coins, tried SGminer for ETH for a few days just to see.
But somehow SGminer started to crash my display drivers (it was at first) and then the GPU would mine at it's idle speeds (300Mhz core and mem) ... couldn't figure out what was happening until I started running the benchmark with Afterburner open beside it (before that I would only check the GPU clocks after the hash rates went down the drain).
I was scratching my head trying to figure out why my HD 7870 hash rates were down to 1/6th of what it used to be, switched back to Claymore and everything is back to normal!
Not sure what's up with SGminer, seems some people (like me) have problems with it and their AMD cards but I couldn't find an easier solution than not using it! (there are solutions using older drivers but that seems overly complicated since I would have to download them and start playing with drivers install and uninstall).
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@CryptoMatt that's the next step, I've already opened accounts with 2 different exchanges and plan on starting soon