There's a guy on this site (Macka) and Mack on Mini Riders forum who shims the springs up to pre load them and reduce sag etc ... he says you can get them working really good if you know what you're doing ......... he says AS-02 springs are too weak for heavier riders and the air adjustment doesn't assist the main spring rate .... I thought that the air would work to stiffen them just like older MX bike forks but according to him it doesn't ....
I'm waiting on a new set of 730 mm AS-01's delivered direct from China so in theory I should get a genuine set as supplied from the factory .....