The tips of using the eyeliner brush for foiling and the precision brush for the crease are very helpful! That was the other problem that I was encountering, my brush was too big for the foiling and I kept getting the foiled shadow in the crease....very helpful!
Yep I have the same issue with the foiling....another good brush for foiling and for the crease, can be found at Sally Beauty it is the smudge brush....Face Secrets - Smudge Brush and this is an awesome liner brush from there as well Face Secrets - Concealer/Liner Brush