If I were you I'd follow the above tuning procedure all the way through. Since you will have to have your bow on a press to begin with, with a draw board you can MAKE SURE your cams are sinchronised.
To answer your question directly. First, try a couple of scales first. I know of three in our town, all good quality, that read in a 5# difference. Your bow just might already be to weight.
If you are confident with the scale you are using, it will depend on how tightly your cables are twisted already since an additional twist to a tightly twisted cable will yield more movement than a twist to a less tightly twisted cable.
ha Ha I had fun writing that.....but it is true.
In the end.......I'd probably start by keeping a log and give each cable a full twist, then check your poundage. Keep doing this until you get the poundage you want.
Every time you twist cables to up the poundage you are also increasing the draw length. Like the article says, it's about a 3 twists to the cables to one twist to the string.