Originally Posted by olec
If you still need stiffer spring, you can also contact Javier @ Trailtricks. He has progressive 8.4-10.4 in stock. I have one and it works very well, both in the woods and fast gravel. I weight 103 kg's w/o gear. I didn't change the fork springs as it works good enough and they must've been a tad too stiff in comparisation to what they threw on the rear stock wise. It's more 'balanced' now.
I used the Superplush 90 spring rear and did nothing to the front. Great results as well.