There are 5 Pred X11 at my club (Faversham) we race on a polised wood floor and they seem to be going well.
I too had Preds as a youngster a Carbon tub one and an International and have had a X11 and got another one coming!
All I would say is check out the set up sheets on Petit Rc website, take a look at Kev Lee's set ups (he won Stotfold national on astro so gd set up for torch?) and discuss your issues on here.
I'm sure other X11 owners can help out.
I'd stick with it, it's a cool car
