Dan
There is little that David hasn't fiddled with on his chassis and he seems to be getting it right more than wrong so i would take him up on his offer.
In general terms you can't simply look at the rear for adjustment, however, Castor, front width, ride height and possibly even tracking will have an impact so look at the total set up. Chassis set up is always a compromise but what you are trying to acheive is a balance. To gain grip at the rear you might need to loose some from the front.
Having driven David's kart on numerous occassions before it sagged due to his girth it was un-believably well planted at the rear. So-much-so that I used a similar rear track to achieve similar results on my old 7Kart - he doesn't let me drive it too often now!!
Graeme
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