Matt. I did notice the holes, they look about right, compared to what others are doing. 3.5ozs just doesn't sound right, was that a guess? Looks more like 2ozs for the completed lure, but I am only guessing too.
You may not need weight in the tail, as you have used two hinges. Many I have noticed, using a single eye in the tail, this would probably need lead to keep the tail straight.
I guess the bristles thing is a case of comming up with a routine that works for you. A few more tails and you will have it sorted.
Being left brained means I am very organised, I have routines for everything. Working with solvent based materials, usually means having a piece of kitchen roll soaked in acetone, ready for wiping my fingers on.
Dave