Another thought on stacking..
Depending on the size of the bug, large bass bugs Vs. spun head on smaller flies, the selection of hair really makes a difference. Since I hunt a lot of White Tail and Mulies, I get hair from various parts of the body and this can make a difference on the coarseness of the hair. We also hunt for does to cull the excessive deer populations and I intentionally try to get a very small deer. One that will not survive our winters. The hair is excellent for smaller flies and stacks real tight. If you hunt or know someone who hunts, get an entire hide and collect different coarseness. Some patterns I use a mixture of coarse and fine hairs alternatly to get that real tight stack.
Pete AKA Frenchcreek from Calgary