I have to agree with a couple of the points that were brought up. I don't like to shave reeds unless there is no other way around it, meaning that a customer does not have the air or form to make the call work as designed. This is usually a "band-aid" fix for a goose call and a caller that don't really fit together. I start some kids out on a shaved reed if they are having trouble getting the call to break over, but I always get them into a full reed as soon as possible. I find that you lose alot of the crack in the break between notes which tends to slow the call down considerably and shorten the vocabulary of the call a bit. You don't really notice this as much in a honker call, but something short like a lesser or cackler call it becomes a deal breaker to me.
I've always found that there's a sweet spot in the barrel bore dimensions that you have to play with to find. Bills guts are great, and they work well in honker calls. I personally run a shorter barrel with a 3/4" bore over a 7/8" tenon to keep my note speed up, and a longer exhaust with a significant bell at the end to give that big, deep, hollow tone that works well on the honkers out here. There's give and take with each gut system, and you can't shortcut the work to find it. I got a good deal on a bunch of 2x2 poplar stock a few years back, and I used it alot when I was trying to figure out dimensions for a new gut. Just take your time and watch the length of the reed from the hinge point to the tip, as that dictates the overall tone of the call. I've found that the difference between a perfectly tuned call and a running call can be small enough that you can't see it, but you can definitely hear it.
Keep at it, there's a ton of good goose in those guts!
Bob