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I think you said earlier, Ryan, that you'd already stripped and cleaned the caliper so you should be able to push the pistons in with your fingers without too much resistance. If you do that with the cap off the reservoir (surrounded by paper towels in case of overflow) you should see the level rise quickly with perhaps a small 'squirt' above the bypass port if it's clear. If the level in the reservoir doesn't rise (or only rises very slowly), then maybe a blocked, or partially blocked, port could be the problem.
You did say that the pushrod looked a little grotty, which might indicate that there could also be corrosion within the master itself perhaps blocking the port.
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