Sounds like you are doing everything correctly to me.
Maybe the problem is you are expecting more piston movement than they are designed to have. When you are testing things after the bleed are you re-installing the pads and wheel, pumping the brake until you get resistance, then testing? The pistons actually move very very little under use, and the pistons will push out until they meet resistance from the disk, then only retract a tiny bit when the lever is released, < a mm each maybe.
Another thing it could be is that if your pads and/or disk are really worn out, and you are pushing the pistons all the way back in before bleeding, there may not be a sufficient volume of fluid to move the pistons out far enough to make contact. I would think both the pads and disk have to be VERY worn out to get this result though.
2 solutions are possible in this case...the first and best is replace the pads, and measure the disk to make sure it meets the minimum thickness, and if not replace it too. The second is a trick to increase the fluid volume, and it's not a great idea, so I'll skip it.
Hope that helps.
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