Although I never had any issues with the Estes D13 or E15, I had PLENTY with the FSI F100 and especially the E60.
With the F100 I had maybe a 25% cato rate, and with the E60 I had a ridiculous cato rate of over 50% no matter where in the core I inserted the igniter. It amazes me those turds were never de-certed.

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When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, and HAVOC !