tacocat, some things that will help you:
Use a semi-gloss finish on your base coat. The spray will not adhere as strongly, and slough off easier. Gloss makes it come off super-fast, but it's much harder to control, and harder to get "chips".
The more layers of hairspray you put on, the easier it will come off. Use a hair dryer to dry between layers to speed things up. You really shouldn't have a big issue with detail obfuscation unless you're brushing the paint on.
The SOONER you start chipping and sloughing it off, you'll have a much easier time.
By the way, you can also brush hairspray on by spraying it into a cup and then applying it.
I've tried some of the hairspray alternatives, and they don't seem to me at least to be any markedly better or worse.
I ALWAYS count on having to possibly touching up a section here or there; it's part of the wonderfully-random nature of HS weathering. I suspect that all the Masters of the hobby do as well, but they just don' tell us. Myth-making, ya know... ;)