[Darren69]

What front tyre profile do you have on it? I imagine the shock will be past it's best by now as you say and maybe that's the cause? What's the ride height set at? As standard they are too low and the tie bar if never adjusted is likely to be seized but you can change that if you're doing the shock anyway, you can get longer ones as well from other models.

I fitted an Ohlins (DU046) to mine and the spring is too soft for my weight but it still handled fine and I could get it in the ball park with the pre-load adjustment, a Nitron would probably be just as good with the correct spring.