The E60's were labeled correctly.
FSI E60s were and are still the most cato prone motors I ever had the DIS-pleasure of owning/flying; well OVER a 50% cato rate no matter if the igniter was placed top, bottom, or middle of core. They made a lot better M-80s than rocket motors.

The F100's were actually like F70's.
Most D, E, and F FSI motors BARELY tested into the impulse they were labeled and sometimes not even.
The F100's and F7's usually tested between 38 and 45 n-sec, even though they were listed as 50 and 55n-sec respectively.
The E60's were usually somewhere around 35n-sec
The awful E6x motors were sometimes below 20 nsec and barely equal in total impulse to the Estes D12. Think of the E6 as a REALLY WEAK version of the weak-thrusting Estes E9.

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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, TURMOIL, FIASCOS, and HAVOC !