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When I took the photo I had one lazy piston and one moving more freely so I think I'd offset the caliper to account for that.
I actually think opening the bleed port and pushing the pistons in mainly forced fluid out from the outboard side of the caliper as that is where the bleed port is. I had to open the lever bleed port and push that inboard piston back to get the fluid out from that side.
I’ve flossed the pistons and done the piston advancing procedure and still got pretty much no discernible gap between pads and rotor when I get it all back together and give it a few squeezes.
I can see a bit of piston sticking out the calliper when the brake is released, these pads are worn but send like if the pistons would retract further then they’d work alright.
I can see both pistons move when I pull the lever.