I am currently using the 4mc with a kt backbore. I like my sound on it. It fills up the room with a big sound. But i notice when i get up into the G and A area (above high c) my sound is still big and full but i feel like i am blowing into a paper towel roll. I think that a different backbore might solve my problem; a smaller one. What backbore(s) should i try that my add a little bit more resistance up there, than my kt backore? Or should i try a different cup style? Thank you.