Page 23 & 24 in the kit manual has tuning tips. They do discuss the slipper a bit there.

Also, note on page 10 at the bottom left it shows a pic telling you the distance between the slipper nut and end of shaft should be set to about 2mm. It's actually incorrect (as is the 44.1 manual too) because to even get the nut & spring to start to screw down, it's far more than 2mm (using digital calipers here). What AE actually means here (and I learned from my B44.1 days) is that measurement should be the gap left between the slipper nut and the drive cup (once the drive cup has been connected). It's about 2mm on the newer longer VTS slipper in the 44.2 , but my 44.1 (single disc slipper) was a setting of about 10mm.

You'll need to set the car down and do a launch to listen for the whistle of the slipper take-off. Set that slip for about 1-2 feet before the whistle sound goes away.