Well, first of all I apologize for my english (I am Italian). I thinck that you can find several handmade kits for you front. I know an artisan in Italy, which produce new springs, pre-load cylinders and also the connecting rod for the rear shoch absorber, increasing the load on the fore fork. In my Italian forum we all have tested these upgrades. You can change also the oil viscosity.
All for 100-150 euro.
If you are interested you have to register to the forum of
www.sv-italia.it and contact the user dilone .