Me and a buddy of mine bought the same glass calls one year. After a few days of messing with the call I really couldn't get it to sound very good so I just tossed it in a box with my other calls. The next time I seem my buddy he took his call out and started running it. Man my mouth dropped it sounded awsome. I asked him what he did and he told me he sanded the crap out of it... So that is what I did and that paticular call goes in my vest every year now...

So sand the crap out of it