You can twist on either.
If the top one is getting to full draw first
twist the bottom cam cable(makes it shorter)
or untwist the top cam cable (makes the cable longer)
its your choice
I like to keep the twist in both cables as even as possible....esp with a 2 color string
The two senerios can be switched visa-versa
experment with it.....thats how I learned and most of the others on here I'm sure.
If you need more help pm me and I can call you if you like
Good Luck and have fun
Bubba