after watching the video a few times, i wonder if the pilot was holding too much up elevator? if your like me? you may have added a bit more movement than recomended in the comic. i have only flown the kyosho pitts on the reflex flight sim, but if you hold in full up elevator at slower flying speeds, you end up with results like your video. i do have the model sat waiting for a spinner so i can go test fly the puppy. i have used a YS 63. i mounted the motor at a similar angle to what it gives for a 2 stroke and i only have rocker cover and the exhaust out of the cowel. i also moved the tank back as far as possible to get it nearer the CG as i thought it well forward and worried about cg changes during the flight. i hope the maiden ends up a little better than yours. i'm starting with a 120mm cg location.