I posted this elswere here but I will put the info here also.
I recently set up a high country ssr with a whisker biscuit and tuned it without any tool just eyeballing horizontal and vertical then fine tuning by reading the paper tears. It took me 5 shots to get a bullet hole.

Shot 1. left low tear, I lowered the rest one line.
Shot 2 medium low left tear, I lowered the rest one more line and on shot 3 I got a dead level with a left tear. ( A dead level tear left or right means the turbo height adjustment is correct)
Shot 4 I moved the rest AWAY from the tear one line . ( This is opposite of what you do with conventional fletch) Final shot BULLET HOLE.

The biggest mistake most make when tuning the Whisker is moving it to far to make adjustments. It usually comes in tune with very small adjustments.