Just removed a set of progressively wound springs from my Funduro. As usual the close wound springs had sagged out solid, and I had in effect a 225 mm spacer and a 325 MM spring with about half the correct number of coils - there is a reason why Ohlins, Traxion, Maxton and anyone else who knows anything about suspension does not use progressive springs.
On a GS a Ohlins with a 450 lb #80 spring at the rear 16mm preload, and damping 7m clicks out works perfectly, but it is properly damped . It gives me 45 mm rider sag, and as you want 10% more sag at the front it is set at 50 mm.
Forget the rubbish about setting the sag at 1/3 of travel , it is absolute stuff and nonsense .
Balance, front to rear is what you want, with the front 10% softer than the rear.
Spring preload should be in the range reload 14/18 mm at the rear and 12/16mm at the front - if you cant get the sag you want with that you have the wrong spring.
The springs from the HPN inserts are available from one of the German spring suppliers , and with a 90 mm spacer they give me the required 50 mm sag, and I suspect packing the stock springs as Rob has suggested will do around the same. Matches the rear perfectly for the magic carpet ride both ends.
The HPN inserts are set with minimal compression damping and almost maximum rebound damping, this can be approximated by using different fork oil in each leg 2 1/2 in the compression side and 15 in the reboind
