Caltrac split mono

[CrateCamaro]

Had anyone ever seen a split mono wear out? Ive had the springs for 11 years now just wondering if anyone has had an issue with a set wearing out. Been through the car several times now changing out components im missing a few in the 60ft and the car barely uses the wheelie bar anymore. Just doesnt have the reaction it used to have. Ive tried moving the bars up and down, different preload settings, different shock settings with no luck. Changed the cage and made the car way more stiffer and all my problems started. 10 second stocker...used to go high 1.30s in 60ft with the nose way in the air to or passed the 60ft and now constant 1.41 to 1 44 with about a foot of air under the tire. AFCO BNC fronts, moroso springs, global bushings, Calvert rear setup with rancho 9 ways set at 7 clicks. Shocks seem fine and react to adjustment. Just cant sort it out. Car previously had a mild steel 10 point and now has a CM 10 point with no bars passes the firewall. Cage is tied to the A pillars in the dash area.