"IF" tightening is the problem, there are several ways to go about it. I would have to know for certain what is causing it.
There are many exercises that can be done to resolve your problem. While I am very willing to give exercises over the internet relative to a specific hypothetical problem, I would not want to suggest exercises to you without being certain of what you are dealing with.
If you send me a clip, I might be able to make enough conclusions to be able to make some suggestions
TS
Be not the slave of your own past. Plunge into the sublime seas, dive deep and swim far, so you shall come back with self-respect, with new power, with an advanced experience that shall explain and overlook the old.
Ralph Waldo Emerson
TS's Blog:
http://tsvocaltech.blogspot.com