I prefer ALL OTHER Aerotech propellants over Blackjack and Fast Jack.
Not a big fan of the black exhaust.
I like Mohave Green best, closely followed by Blue Thunder which is about the closest to original Enerjet composites.

Any chance of getting Mohave Green in 18mm SU/RMS or 24mm SU/RMS ?

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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 !