I very rarely measure droop, I'll usually set by feel on any given meet, it's often an on the day tweak you do like shock position etc, things you alter to track condition at the time your running, I still ignore if the shocks unload or not, thats always a debate in itself.
While I'm here, I caught a bump, some air, and shattered a body shell on my Viper on the weekend (no other dammage, go figure), whats a good strong club racing body that suits the Serpent?