Ok checked stock and no springs that light. That is I believe a 46mm shock like the 1090R and seems a 62/63 ID pds spring would be too large ID. Custom spring takes 6 weeks to get made. Know the rate of the spring before you buy. Ive seen some that say they are for 185lb to 225lb riders or whatever and that simply ain't so. Get specific and benefit. Regarding the stacks. A x/over in the the face shim stack somewhere. The x/over will allow the wheel to move in rocks but still keep the bike up in the stroke where it needs to be. Or you can drill a bleed in the shock piston if you want and then increase valving and that will have similar effect. Digressive does not sound right. A bit of movement or bleed on top of stroke for rock, braking bump, acceleration bump compliance then hit the brakes with more shims to keep the bike from going too deep and bottoming. Progressive. Remember you have a stack in the high speed adjuster. You can stiffen that stack as well. Your shock can work as well as any out there. Maybe not for putting the hammer down in a long whoop section simply due to 46mm has less oil. But performance wise it can work as good as "any". When you decide to go back in, email me your stacks and leave a phone number. I will walk you through to an epic shock if you want to do the work. With that I would want you to order up a progressive spring from me or anybody, I do not care as long as it is correct, and go all in. When I say "any" I am talking about the untouchable Ohlins and the WP Trax etc. etc. etc. email@example.com It would help if you have the original stacks fyi. Then we will discuss the options and put together a game plan.