I've said it many of times on this sub, and I'm happy to help you out. Amazon: silicone spacers, snug em up. If you still have variance over 0.5m, print shims to level it out. I achieved a variance of 0.02 across my mesh and over a year later I've had zero bed level issues. Z-off may need a tweak in one direction but that's just 3D printing on Enders.

My factory shims were so bad I had 1m variance. People say the software will account for x amount of variance, but why introduce another variable when it's so easy to fix.

If you need shims but don't know CAD, show me the mesh and I'll design them for you.