In GTA V I get constant 60 fps on high settings but while this is happening my GPU Usage ranges from goes like 60%, 90%, 12%, 50% and so on. Basically just super unstable. This causes me to get huge lag spikes every minute or so which actually rubber bands me within the game making it nearly impossible to win a race. I don't have any overclocks and GTA V is the only game I see this issue.
Intel i5 6600k (Stock clock speeds)
Sapphire R9 380x 4GB
16GB HyperX DDR3
HyperX 250GB SSD
Edit: After posting I've realized that my CPU usage being around 95-100% is most likely to blame. Any tips for solving CPU bottlenecking. I have tried closing everything else in task manager, and I set GTA V to "high priority" but nothing has worked.
Any help is super appreciated cuz this is so damn annoying.