Question / Help Am i using the wrong encoding? nvenc or x264 with a 9900k and 1080ti ?

Hello all, could use some helping insight please.
I'm gaming on a single PC with the specs of...
9900k with a 1080ti
2566x1440 ASUS monitor, 32g of ram 2900, on a 370z mobo. Internet is 400ish down and 20ish upload.
Presets of 1600x900 using either a 'fast' or 'medium'. Is it better to run 720p @60fps on medium or 900p @60fps on fast?
I tried to run the Nvenc encoding but I seemed to have issues (depending on which game I use).
Uncertain what I'm doing wrong but it seems like with this sort of equipment on my PC, my stream should be crystal clear but they aren't (on games like Apex or Battlefield V). I'm debating going to a rtx 2080 perhaps?
Thank you in advance!
 
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