I tried slightly angling my throwy D4S and the changes were about 1, which is hardly significant, which is surprisingly good in my book. With my old ceiling bounce, the same angling would result in probably 20-30 difference.
Also my super wide flooder MT03 (similar flood to X80) measures about the same lumens as the much more throwy deep reflector MT09R. Both lights uses the same TA driver, identical binned 4000k emitters, and tested on the same set of fully charged Sony VTC6. Therefore your concern that TA tube favors throw over floody lights is not true from my experience.
Also I want to repeat, TA tube measures about 7% loss with DC-Fix applied whereas ceiling bounce measurements exceeds 20% lumen lost. I believe Maukka also tested DC-Fix to be about the same as the TA tube (correct me if I’m wrong). Frosted optics would reduce lumen output by probably 20+. I’ve seen reports here that even changing clear optics to another clear optics can improve lumens by I think it was 30 or so.