What are your apex settings for the xim? Dpi and all? 65 SAB seems so high yes no?
65 is actually the recommended SAB for the call of duty series. Everything is normal as far as you being able to Sprint in a straight line without veering off to the left or right due to too much SAB. When you go above 65 for COD you'll began to feel it. And the closer you get to 100 the more your character will began to feel as if he's drifting. I think 64-80 is okay. But I usually go with the recommended to be in the safe side. Each game has different values that function well for its smart translator. Overwatch, for instance, works well with any value up to 125 from my experience. Some people have stated using 150. I usually start at 65 and either go up until I find the max. But, ultimately it's your preference that matters.
I came from the Xim 4 so I use 125 hz on the Xim specifically for Infinite Warfare, I've lowered my mouse polling to 500 hz and I run a mouse sensitivity of 14 on hip and ads. My SAB is at 65 with an in game sensitivity of 18 instead of the recommended value of 20. It works for me. Im always in the air on every single kill. I never touch the ground unless I drop shot. I play like a pure maniac lol. But, the speed of this setting will allow you to laser everybody. My dpi is 12,000. THIS IS SPECIFICALLY FOR KEYBOARD. It will be way too fast for nav users.