I use a different product with the same results. It takes forever, last time I did use a paint brush to get into the cracks and crevices with good results. Just be careful getting the splatter on your wheels, I kept a towel with me to wipe it off. Next time, I'm probably going to mask off...
If you're going full ppf, just have them polish the paint before they apply the film. No reason to ceramic the ppf as rocks will ding up the film no matter if it's ceramic'd or not. Kind of a waste of money
Same thing I'm currently deciding what to do. Everyone just throws the tube does on, thinking I'm going to powder coat the doors to match the body. Not sure what I'm doing with the handles yet.
These are 709's with the 106.25 bore. we just installed the little sleave that comes with the wheels, zero issues, drives nice and smooth at 75+ mph down the highway. Personally I'd find the offset that gives you the look you are chasing and ditch the spacers.