This may not be a good suggestion, but, I have a cauterizer at my fly tying table and I use it to burn any unwanted material trapped in the whipfinish and for removal of material on a fly that is "chewed" up and no longer useable. Once the material is removed, I can re-use the hook. You might be able to use the cauterizer to even the material out.
This may not work and may be a bad suggestion. Only you will be able to know.
Warren
Fly fishing and fly tying are two things that I do, and when I am doing them, they are the only 2 things I think about. They clear my mind.