Ok, it's been a thing on TF that really annoyed me over the years, newbies come and post on TF asking why one of their magura pistons ways sticks out and barely moves while the other moves freely. Then you get 20 people with different advice on how they need to re bleed, re bleed with water, rebleed with oil. Need to lube the pistons, an a host of other things.
All that is happening most of the time is that they've got the bike with maguras, used the crap out of them and they just keep on turning that red tpa further and further. All the tpa does is push more oil through or it takes up the slack. Once the tpa has taken up the slack, any more adjustment is going to push one pad out only, it's very rarely going to push out both pads evenly because there's always going to be one piston that's free-er than the other. The more tpa the more that pad is going to stick out, and the closer it'll constantly sit to the rim.
Simple fix is just undo the tpa right up to the point just before it hits that slack point, then re-position the actual pistons and everything'll be fine.
Yes, you're right, I take that back.