Sorry, correction here!
Your AOS must be filed under the INS Service Center that covers the place of your residence. So, I think you need to file under Texas Service Center (I think it is TSC, but please check it out with your lawyer). If you file your case with Vermont, there is a good chance that INS may transfer your case to Texas. We have seen that happen to many individuals on these discussion boards. I apologize for the error in my last message to you.
Consult an immigration lawyer and do the right thing. Transfer of your paperwork will definitely delay the entire processing.
Just an advice.