Have you at any points just gone completely off AAS including test for 8 weeks? I do that ~once a year adn another two times go off for 3-4 weeks. That gets my hematocrit down from as high as 56% to 46-47%.
I had very top of range rbc/crit even before trt, ~12+ years ago, when serum was 200-300. Normal doses don't move it much but 10% higher pushes me through range obviously. Ive never tested below 45-46 I decades, or at least as long as I can remember. Haven't come completely off. I can do phlebotomy whenever I want so I just keep tabs on blood levels and lower it via weekly pints every now and then as needed.