By way of comparison, a Royal .46 was running a MA 11X6 prop and revving up quite a bit with healthy speed and acceleration. The prop was switched to an APC 11X6 and the engine ran much differently. Low speed acceleration improved but top end speed and RPMs suffered.

Regarding your engine; I doubt any damage occurred.
I don't trust the needle O-rings - even when brand new. The chances of someone finding one of my engines without a piece of fuel tubing over the needle sealing it against the throttle barrel are very slim.

Try an APC 11X4 or 12X4 on your TT. You may be surprised.

Jeff