Agreed, but I understand that the big Quest motors were semi-port burners like the old Estes C5-3 that provided a real kick off the pad with a lower sustaining thrust.
The Estes F15/E16 are end-burners with lower launch thrust.
Unfortunately only Estes remains in the SU BP engine market, and they continue to show zero interest in making anything in the form of a port-burning high thrust booster.
Yes, I'm still "beating this dead horse" and will continue until somebody ( hopefully Estes ) brings back some port burners.
Incidentally I managed to get 2 sealed packs of good-date-code C5-3s off eBay for the reasonable price of $13.99 very recently.

__________________
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 !