I've reached levels above 1500 (that's as far as my lab can tell) with a single, isolated shot of (4ml) Nebid. About Test E, that's also what my endo told me. Nebid was inconstistent for me, yet I was refused an alternative other than gels, which also I tried and drove T down to castration level. He's not my endo anymore..
You see, problem with Nebid (for some!) can be the protocol. It's the same thing with "old school" schedule of 250mg EOW Test Enathate all over again. And while you might break open an amp of testoviron and perphaps throw half of it away, doing so with Nebid can be pretty much expensive.
Also you cannot cicle Nebido, let alone year-wise. Due to its slow-release, it takes a lot to "kick in". For some could be six months. For me it was, well, never. I have been more than a year on it and couldn't even get my beard growing steadily. However, this can be an advantage with excess aromatization, so be sure to weight factors carefully.
Underfunctioning testes usually results in hypergonadotropic (ie HIGH luteotropin) hypogonadism. Normal LH with low test is still a hypothalamic/pituitary issue. For some it could even be mixed primary/secondary, however.
Your SHBG is very low, which means fast clearance of T. You might need shorter than average injections interval. Also consider a "loading" second pin of Nebido at 6 weeks (just as Bayer advices), otherwise it will take forever for your T levels to stabilize.
Lastly, did you check for autoimmune thyroid disease? If that is your case, iodine might worsen it, so beware.