Setting up my old Vector 2 for my son

[DeoreDX]

My son is 10 and is starting to get into mountain biking.  He had a rigid 24" bike I outfitted with an old set of LX RF+ and a old triple crank set and he's been riding that on the trails.  He's been itching for a new bike but I didn't want to drop money on a new bike until he gets big enough to ride a 27.5.  We were up visiting my parents and my dad gives him his old Raleigh M50 that I had set up for him with my old Girvin Vector 2 when I moved to the Crosslink Pro Carbon.  He actually fits and rides comfortably on the bike but I had set up the fork for my dad who was closer to 200lbs.  It has the red Speedsprings by Eibach labeled MS-Pro3 I don't recall what the weight range they were for but I'm guessing at least double my son's weight.  My bike had the NB2-200 listed for a 140-170lbs rider.  Since I'm about 20lbs heavier now than when I originally set up my fork I'm now over that limit so I'm thinking at a minimum to move the NB2-200 to my son's bike and use the red spring for myself.  I can't say for certain the red spring is for a heavier rider but just looking at the number of coils I would assume so.  I would still prefer to find a lighter weight spring as he doesn't get much activity out my Pro Carbon with the NB2-200 when sitting on my bike.  Would the elastomers offer a better ride for someone of his rider weight? Or should I look for an even lighter spring?  I'd imagine trying to find a lighter spring will be like trying to find a needle in a haystack. 

 Also hard to see in the pictures but it looks like one of the black spacers on each side of the shock on the topshock mount is cracked and about to fall off of his.  Im thinking a plain nylon washer will do as a substitute.  I'm guessing it's to keep from getting metal to metal binding and doesn't really need to have the contour to the spacer.  Some old school Girvin bike porn.

[DeoreDX]

It's been a while (like 20 yearsish) since I looked at this but the spring setups are obviously different between the two.  Swapping whole shocks would be the option.  Not sure which spring will be easier to replace.

[spikebender]

I know a while back Noleen made available a NR-1 for Vector 2s thats a strait change out from the original set up. I have Girvin experts with a NR-1 but the dimensions are slightly different than my Vector 2s and I just can't swap them. Saving $$$ to get one to finish of that bike. For me the black spring is to stiff for the front the yellow was to soft I had a NOS yellow elastamere I cut a round wedge piece and put it in the first coil of the yellow spring BAM works sweet. Just like Nascar LOL