the splitting due to glue/cement in the middle coming undone happens on CRC, and Jaco tires when using Jack the Ripper on them. when the tire is small and if you soak them alot prior to a race day, they would start rolling off rim edges. a issue with two-stage tires you have to watch is when your tires are small the outerfoam will separate from the harder foam core. this happened to me when i was at ACR in Oklahoma. i was using full Jack soak on the fronts and by the third heat i had noticed my fronts were peeling bad. 3 weeks later went to Fastlane with the same type tires cut down using TQ Mod and had no problems thru 4 heats. i never had this issue with the Parma and the older TRC's. I haven't tried any of the new TRC (partnered with Jaco) tires with the Jack sauce.