Primos makes some great calls, but they don't seem to fit everyone. Will designs his calls with an extra large piece of tape so that they can be trimmed to fit the individual caller. So far, I have not been able to trim one to sound all that great for myself, but I've heard other guys use them and they sound great.

If you think you're close, keep working at it. Otherwise, I'd try others until I found one I like, or, more importantly, that the turkey likes.