Hey Ben, those x-factors do have a distinct buzz to them at first, but it goes away once the edges get knocked down. However, the barrel design itself lends to being able to achieve buzz clucks easier and makes it easier to keep sound between notes which is what I like to do in contests. Because of it's design it is going to buzz a little more all the time until you figure out how to take the buzz out when you want to.
The Overload was designed off of my way of contest calling and isn't going to fit everybody. Sounds like my Circuit Breaker would have suited you better right now, but if you figure out the Overload I think you will find it has some pretty unique stuff that it can do.
As far as the OP goes, I use all wood calls for the simple fact that I make my own calls and wood is easier to crank out a call for myself. I get the same sound out of wood as I do from acrylic and pretty much the same volume as well. For a hunting call I like to recommend Delrin. It has a good sound and it is tough as nails