Looks like you almost had your own NTSB report for the Porter, good to hear its just a "note".
John Wilson burnt up a flap servo doing the same thing ( diving from altitude with the flaps extended ). It was rather exciting when only one flap came down.
And of course there's always the full size operating parameters to consider (Vfe- max speed w/flaps extended)
You might consider sending the flap servos in to check out the motors - they were pulling high amperage during the short desents. After flying the Yeti for 4-5 hours, I normally have to put about 4000mAh back into the 8000mAh capacity batteries.