Originally Posted by Speedo

I did try building a Sperpent shock with 20wt oil and #3 piston and it did feel similar to an Xray shock with 30wt and #4, but still probably stiffer.

I think it probably has to do with the difference in piston hole size, and the Serpent shocks becoming turbulent while the Xray shocks remain laminar. I measured the holes with a pair of calipers but it probably wasn't incredibly accurace. I didn't think the holes were even 1mm on either shock but I could be wrong. I have access to hundreds of dowel pins so I will find a pin that fits the Xray pistons and test it in the Serpent pistons, then have the Serpent pistons drilled out to the Xray size.

Thanks for the help
Josh