That's a very fast Flash!

I see she still want s to take off when reaching top speed (3/4 throttle as I understand), the boat starts to porpoise and because of the high speed it gets nasty almost instantly.

Judging by the 'flawless' floodchannel, you need to work on the weight distribution, to get her to flip back.

I feel the CoG should be a tad more forward, the hull sanded and the traling edges sharpened (specially the runpad, if that hasn't been done yet.
I say it once more, run without the added drag of the huge canopy, it will pull the hull up at that speed.

Complements to your son for the video footage!
My son could only steer my 12 cell MTB at that age, his photographer's skills were not that good back then....

Regards, Jan.