It's not that it's bad, it's just that a 6700k is a better processor for gaming because it has better single core and quad core performance. I don't think OP has any actual issue. I think he's just expecting that a slower CPU is somehow better because it's newer... Also worth mentioning that 8gb of ram is barely enough for games in20182019
also OP make sure you install the chipset driver from AMD.
well OP is saying he cant hit 75 fps so clearly something is going on. If he had a higher HZ monitor I would probably recommend intel but ryzen should be performing as bad as he is saying it is. I would probably say fresh install and make sure ram is running at stated speeds and yep you are right need 16gb these days to be on the safe side. Alot of newer games will dip heavily with 8gb.