EDIT: In all honesty ... I just (two weeks ago) took bloods and I had been off DAA for over a month. My total test was 870 ng/ml but my free test was ... 17 ng/ml (with 24 being the high end of the LabCorp scale). So my total test is negligibly lower off DAA but my free test is WAY lower off DAA (last time I exceeded the high spec while "on" it).
Not everything works for everyone. DAA has some gastro sides and peeps need to weigh that against what they're getting out of the stuff. Only way to do that is with bloods.