You must not have a 365 caliper then because that uses the smaller B01s pad, as you say the G01a pad is for higher end brakes (my old XTs had them) and the M365 is a low end system.>lower 1mm of the break pads has way less contact surface than the upper part, which will result in less wear, so the brake pads remain thicker there
How so? If the caliper was sitting too high on the disc then it could end up thicker at the top (not a huge issue) but I don't see how what you're saying could happen.>and they chew into the section above the arms attachment point badly resulting in wear on the steel plating more significantly than the part that should be used for braking normally
Let's pretend the cooling fins weren't there and the pads where sitting too low. The pads are a relatively soft material compared to the disc, the part just above where the arms attach would wear down the pads just like the braking surface does and the pads would wear quite evenly. There's no way it would end up causing significant wear to the rotor.>>1092752
As I said above, that's not really a huge issue. You lose some braking performance as there's less surface area applying force but it's not dangerous. However I'm pretty sure the braking track on those Shimano discs are going to be deep enough for any Shimano pads, it'd be retarded of them to make it otherwise.