Flute does not have fewer options than other instruments, it's just harder to get out of the mp-mf range than with things like oboe or horn. It takes time and work to learn the cocntrol necessary to perform a wide range of dynamics without compromising tone or intonation, but you also need a flute that will work with you to produce what you're hearing in your head. Gemeinhardts tend to be somewhat difficult to play largely differing dynamics on. That's not to say that it's impossible, but it can be more difficult than if you were playing another flute. What kinds of exercises have you done to focus on dynamics? If you work with your teacher on dynamics and notice no progress, then the flute might be to blame, but if you haven't done anything specifically oriented to dynamics, then the problem could just as easily be you (or at least partially you).

I never understand why some teachers "OK" flutes on which it is difficult to play dynamics. 30+ years ago a dynamic range was difficult on most student flutes but not today. In addition, young students who find a flute easier to play get more enjoyment out of it. In the UK, the main reasons why Boosey and Hawkes had trouble with their range of flutes was that they were unresponsive, poor tone and as expensive as alternatives. The tone on a student Gemeinhardt flute is nice but without a good dynamic range its not an instrument of choice. You shouldn't expect conductors or examiners or an audience to know/understand the limitations of the choosen instrument.

Incidentally, a competent piccolo player on a modern instrument should have no problem making a lounder sound than a trumpet - except in the lowest octave!

I don't think much of "Gemmies" but I can sound good on one, as could any good player, just that one sounds better on a better horn..logical..

Most stores don't possess the knowledge and experience of Joe B. Some MIGHT be able to perform such an operation, but it's a delicate task (any change to the embouchure hole can have a drastic impact in how the flute plays), and the vast majority of repair folks at local music stores just don't have the ability to alter the embouchure hole and make a good job of it.

It would cost under $10 to have it shipped priority mail if you are in the US. That is worth it in my opinion. I would not fool around by trying to cut costs and send it to a local repair tech.