How are you applying the bowl coating? I was told by a well know pipe maker that he uses his finger to spread it on and that if it's too watery it won't adhere well. It must be a bit of a tarry consistency to adhere and apply well. If after it dries it's lumpy or just not to your liking you can lightly sand it to smooth it out.
I have done this on my personal pipes as a repair but, personally won't do it for a pipe I've made and intend to sell. If burn out is what your worried about I wouldn't worry all too much about it unless there is a flaw in the chamber. And then if it were me I'd just keep it as a shop pipe, not worth the time, effort and worry.
Your pipe is certainly different, not my cup of tea but, that doesn't mean someone else won't like it.
I'm a bit weird anyway and still haven't really liked anything I've made.
Just keep plugging away at it.