The effective options I'm aware of for hematocrit control are dose decrease, injection frequency increase, treat apnea if present, and supplement naringin if you aren't taking drugs it interacts with. I don't know how long ago you reduced your dose, but if that was recent, that may be enough by itself to avoid further donations.I lowered my TRT dose from 150 a week to 100. Other than that I don't know what to do. Some folks recommend nattokinase and I have been taking that but doubt it has much positive effect.