You take your time to perfect it Strict.
Now I remember why I didn't use alpha on snakehook:
When I used an alpha-brush I could only make the stroke once. If I wanted to 'comb' the hairs in a different direction I could never get the brush on exactly the same spot. By using a 'hair-mask' and a no-alpha brush I can always get acces to the same hairs as on the first stroke.
Does this make sense? How do you cope with later on changes Strict?