Take note that right now, the 7700k is having temperature issues, so you probably should not overclock it.http://www.pcgamer.com/intels-tells-core-i7-7700k-owners-to-stop-overclocking-to-avoid-high-temps/
As for your 1070, just overclock it. There's no harm.
I've noticed temperature issues you're right about that...thought it was a problem with my thermal paste or cooling system. Glad it's not a system specific thing. Thanks for answering man!