I have some questions regarding the FPS I get in game and the max targeted FPS in GPU Tweak. I seem to be stuck at 255FPS max as stated in GPU tweak, but shouldn't an i7 7700k and a 1080 strix both OCed be able to get me a bit more ?
Is it capped because of my screen's refresh rate/res (60hz and FHD)?
Should I leave that parameter on 0 in GPU tweak or max it?
My old screen (asus VE276) is gonna be replaced in a couple of days after a few years of good and loyal services.
Im planning on getting a XG32VQ with gsync and QHD. Should it be enough to get an higher Stable FPS rate?
The monitor won't cap your frame rate unless you have G-Sync or Adaptive Sync/FreeSync enabled. Probably better to consider a different monitor to pair with your GTX 1080, since the XG32VQ features Adaptive Sync and not G-Sync. Having a higher resolution monitor won't allow a higher frame rate, in fact the frame rate will drop significantly. 2K QHD resolution is about right for your graphics card. You won't be getting 250+fps but that is not really beneficial (for humans) anyway.