I have MT520 on my older bike and M8120 on the newer one. The latter got the wandering bite point eventually, but only after I replaced both levers because I damaged them in a crash. I think I got on top of it with a half-arsed gravity bleed, still using the OEM mineral oil, but if not I'll do a more thorough one. Having said that, "wandering" made it sound (to me at least) like you don't know what you're going to get with each lever pull, but the behaviour seems to be very predictable. The same crash resulted in...