I think your numbers are kinda skewed. A "normal" healthy male will produce about 5-7mg of test per day. Lets call it 50mg per week, but it may be as low as 35mg.
The nmol figure is the dilution in the blood stream and does not really figure in the production value.
A typical dose of cream based TRT test would be 10mg per day. Remember though that not all is absorbed. Same goes for injection. Also various types/esters of injectable test may be the same amount injected but have different uptakes so some is more efficient in uptake than others. i.e. Aqueous test is more efficient in uptake than enanthate or cyp. Not that you would be taking aqueous as it needs to be injected every day. Ouch. Most TRT is either cream or other topical application used each day. Some is injectable but they are almost always very long lasting esters. One guy I know gets his injection every 6 weeks.
You may be referring to TRT in the US where I have read that some are taking up to 250mg per week of injectable test, which is really not TRT. Its a steroid cycle, with arimadex and HCG often prescribed as well. See. Steroids aren't illegal. They are just prescription meds, like birth control or valium.
So, while the TRT numbers seem higher, the actual uptake and resulting nmol figure is either equal to, lower or maybe a fraction higher than normal test levels. In other words, its about the same.
You would probably agree that a true TRT treatment would be aiming to have the same nmol blood dilution levels as a healthy male. So the follow up tests would be checking to see if that was the case, with dosage being increased or decreased to keep in "the zone".