I'm gonna add as reference here what I find works well ( well 'tis jospin that told me )
For a FAT string ( 4x3 ) a reduction percentage of 12% seem to give a nice strong but not too thigh string. So for example, you start with 100 inch worth of lenght, you stop twisting when you have gone forward for 12 inches. Resulting string will be around 70-72 inch.
Next step is, you tug pretty hard on both end of the string. This remove almost all the elasticity and to be able to maek some nice wirewalker I found that running the string though a hook and just pulling on it back and forth will remove the 'new' thighness that's detrimental to wirewalker...
Next step will be me trying to see if 12% is good too for STD string ( 4x2 )... I will post back my result here.
I don't like the current way in the manual b/c it ask you to go too far or almost, and what happen is that when it start to kinks up, there nothing really you can do without a second person to fix it.
I hope this is helpful to ppl.
I intend to start another thread for FAT vs STD when it comes to regenerative play but this is not the place!
Cheers