Not sure of what you are inferring but I got rid of my Stroud mechanical chute launchers due to several launch failures and also lack luster customer service. I've gone to White Safety air launchers and have had zero failures.
Not sure what spring perch or PRS is but we use an air dump. Full pressure to the Penske shock at launch to pretty much lock them solid and then dump the air at about two seconds out to let them act as a shock.
This is great! Thanks Will. It would be great if the Pro-Mod type tech posts could be ported over here from ITA. There has been some great subjects lately that can't be used in TAD/TAFC and really only apply to Pro-Mod or outlaw applications.