Mate......have a search around some of these forums/sites for fader modding:

http://www.asisphonics.net
http://www.sqratchattack.com/

A lot of scratch djs rate P&G as thee best scatch faders........especially the rane magnetic ones.........

maybe u need to buy a diff P&G fader, more suited for scratching, and mod it to fit ur A&H.....scratch P&G's can be modded to fitted into Stantons and other vestax mixers.........so may be worth having a bash at the A&H......

I'd love a really top 'mix dj' mixer, with a scratch cross fader.......
the Rane Empath mixer looks tight for that, but its ££££££ and no fx.