For your first question, this can impact your Testosterone levels if you're not resting properly. I'll barrow from one of our earlier replies:

"The majority of your Testosterone is produced and released during your rem cycles. That's why it's so important to get a full night's restful sleep and make sure you have the hormone building blocks in your body that you need. This is also why you wake up with "morning wood" and why men tend to have a higher libido earlier in the mornings."

This is the first thing we would question normally, however you are indeed already on Testosterone. So, we would want to measure stress & fatigue, because these are things that Testosterone can't always take care of. These things will prod estrogen and cortisol around which can also have effect on you, though you do state everything was normal.

So, if your results had T as abnormally low, you might just need more than 140mg/week to convert to the level you need.

For your second question, as long as we've Dx'd hypogonadism and need for TRT, we move on to treatment. For deciding where to start, that isn't as hard as it seems. There's a certain amount that needs to be given to overcome the natural loss from taking additional Testosterone and an upper end that's outside of the "standard" treatment range (namely above 200mg/week) by the DEAs opinion, so we tend to start around 140mg-160mg for patients and see how they respond from there.

There is a lot more too it, especially when going higher, but that's a good basic starting range.