This is very true. Pharmacokinetics differ so much, that just judging by bloods is really a hit or miss. That is, if you don't know what your blood serum numbers are usually on a specific dose of test.
For instance, on 250mg's my TT is 3 x upper range. Somebody else will have TT at 1500 on 250mg's. This is really a common thing.
Imo IA are really just bussy af with all the orders and this is why they aren't very responsive. They have a good thing going for them, I doubt that they are intentionally underdosing test. I mean, who df underdoses test? It's the cheapest raw.
Floaters, ... that's another story.