Looks like it flies like the 1284 Estes Space Shuttle when underpowered by a C6-3.
Almost cruise-missile halfway through the burn.
Looks like you need at least double the average thrust you had.

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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 !