Hi Tam
I am more than happy to teach you to fly scale. In fact I will teach you to fly anyway you like. Just send the tickets over. Anytime in October is fine!
I understand that Crow will help but trust me so will the fences. I am sure also the fences will help in normal flight as well as slow speed flight.
The same applies to the ventral fins. The reason why I say this is that I have recently flown two comp-arf hawks. One had ventral fins and wing fences fitted. The other had neither. The difference in the way they flew was really quite dramatic.
Regards Al