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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.
it may just be the angle that the pic is taken but is your disc actually centred between the pads?
loosen the caliper bolts, pull the brake lever so that the pads grip the disc and centre themselves, keep pulling the brake lever.
Without letting go of the brake lever tighten the caliper bolts