Have a look at the recommended tuning tips and upgrades to improve your fork.
For:- Sigma XL and TL.
For:- All Alfalfa's.
For:- Delta XL and TL.
For:- Delta HL, Pro, Comp, Zeta TL, EL and Gamma XT, TL or HI-5,Pro and Comp.
For:- Gamma XT,XE,TL,EL 381XL, TL, EL and 281TL  or 461 DH,461, 381DH,381R. 
For:- 281EL or 281,280,261,260,180,171,170,161B,160 and 156B.
For:- 381 XE, 281XL or 281DH.
381CL, 200K, 901, 801, 800, 700, 167, 156, 154 and 150.
For:- Corsa ST,906,905 and 802.
For:- Disc brake calipers.
For:- Disc brake hubs.
For:- Rear shocks.

If you are not sure how to make these changes please check with the maintenance manuals first.