I agree that your levels seem pretty low for four months on, and that's probably why you're not seeing many changes in anything (including your cycle - may also be why it's messed up). I'm three months on and my last levels where at 297, just under the preferred range, so my endo bumped my dose up to get me there - no questions asked. No, i lied. Actually, he asked me if i wanted to stay on the current dose or go up - i chose to bump up and he agreed.
His goal right now is to get me at the lower range, maybe around 400/500, see how my body handles it, and then bump up as needed depending on blood counts and such. I started on very low dose due to other medical concerns and we're raising it up slowly as well, but ultimately our goal level is whatever my body is comfortable with (IE stops the cycle is the biggest thing i'm looking for).
But i'm 29, i don't know if it's the same protocol for teens and young adults. Maybe, as another poster said, they're more likely to raise your dose more slowly. Or maybe your endo is being cautious. Is the rest of your bloodwork okay? Are they experienced with HRT?
If your cycle is messed up, i would consider that visit-worthy to discuss it. I wouldn't put up with a month of bleeding. Nope. You don't have to be confrontational about it, but be honest. You're unhappy. You would like to know if your levels are too low, if they say that isn't the issue ask them why and ask them what they think IS the issue and how to fix it (without more hormones). Ask what their goal is for your treatment - are they trying to raise your levels super slow (if so ask why), why aren't they raising your dose if your levels aren't in the preferred range, etc. You won't sound like a know-it-all, you'll just sound like you're well informed about what you're doing. Always preferred, at least with my doctors (my endo loved it when i just started asking questions and making comments and was very happy to answer all of them.)
If all else fails, you can always get another opinion from a GP or another endo. Or if everyone agrees that it isn't T related, dread dread.... you can go to a gyno to try and figure out the cycle stuff.
Good luck!