The original poster had High T levels to start with. Maybe he didn't notice much of a change. I noticed a significant change going from <120ng/dl to 500ng/dl (still less than OP). I always drop weight when I am on T and get much leaner without changing anything else. Well it does make it easier to work out and diet but even without any changes it makes a big difference. Each time I go off and onto something else like clomiphene I gain 20-30lbs that is not lean at all.
I believe he said he got close to 1000ng/dl naturally, which I consider on the high side based on lab ranges. 400ng/dl is actually interpreted by some doctors as low depending on symptoms even though it's "in range".
Yeah most of what I read seems to indicate you should be on the high side in your early twenties but ultimately if you are at 400-500ng/dl and you don't have symptoms that is probably normal for that person.
