What didn't you like with their mounts? I only have 1 rifle can, 762sdn6, and it doesn't wobble. My brothers m4-2k doesn't either. But maybe my teeth aren't worn out? Bc I hold the button when I screw it on/off. Heard if you don't. It'll wear down the teeth as it clicks
From what I understand, it's a crapshoot. Some people have lucked into tight mounts, some have not. Some folks have luck when the mount carbons up a little and it tightens up, but I don't run my rifles often enough/let them get dirty enough to find out. Also some people simply don't notice that a can wobbles ever so slightly, and some notice and think it's normal. However, at the end of the day AAC switched to a 90T mount to reduce the problem, but currently there's no way to upgrade an existing can to 90T (I would do so in a heartbeat).
My SDN-6 has wobbled on the first two mounts I bought. Had to literally file down each mount ever so slightly so that the can would grab the last tooth all the way. Both mounts out of the box would either simply not grab the next tooth to sit flush and not wobble, or if you really torqued down it would grab the tip of the next tooth which would sit there precariously before it would pop back to the last tooth. They don't wobble anymore but it seems like something the user should not have to do. Really compared to horror stories I've heard in the past for other companies' mounts, 51T is fantastic since it can be mended to be perfect.