Well, I have had a hematocrit of 56 with hemoglobin 19 more than once, and that was on 500mg of test (HCT didn't become an issue until a few years after I began using anabolics, then stayed high).
Honestly, I felt no different. BP and platelets were still low. No apnea or any symptoms of it either. Kind of sucks but it doesn't take much over TRT to get my HCT and HGB in that range after not very long.
I’m not saying it’s safe to have high Hemoglobin but it seems most of the dangers come from high platelets.