You guys in U.K. have much different conditions from what we're used to here, so this is somewhat different for you. But here is the "standard X Factory line" on belt/slipper adjustment and belt skip:
A little belt skip is desireable. If you get it to absolute zero your driveline is too tight and you could go faster. The really fast X - 5s skip 2 - 3 teeth on acceleration and 5 - 6 on hard braking. Best is to have an experienced X - 5 driver listen to your car at the end of the straight.
It's very much an art. I know we're all engineers here, so art is hard, but this is cool art. Slipper and belt tension work together and must be adjusted together, especially when at a new track or with a new car. Obviously a looser slipper will have less belt skip, and a super-tight belt will make the slipper slip a lot.
On first putting the car on a track you must run a few feet, then adjust, run some more, adjust, and keep working back and forth between the slipper & belt tension until you get it right. Sometimes this will require a trip to the pits.
But stay with it and you'll hit the "sweet spot." We knew these adjustments would take time and patience, and part of the design of the car is that once you find the sweet spot, you set it and forget it. No need ever to touch the belt tension again until you change belts. And to change spurs, count the revolutions taking off the nut, then replace to the same spot. That adjustment does not change until you change pucks.
When you get it right you have the fastest car on the track. Very satisfying...
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