Yes, the little centering magnets work OK (up to a point, anyhow). I didn't know that you're supposed to bend the linearity adjuster.
There's often a little interaction between width, horizontal centering & linearity. I'll get as close as I can by fiddling those three, then call it a day. I have a couple of other sets that you can't get perfect in one dimension or another no matter what you do, so you pick the compromise you like best
Phil