Hi Winglift
The aileron reversal is the only traite that this plane has,I have never encounterd this with any other model I have, mine has been flown quite extensivly so I can tell you this for certain. As to what causes it I am not 100% sure but speaking to another flying friend of mine who works in the full size industry he sugested that it might be a case of insuficant fin height? as it would have been quite difficult to alter this and by how much you would have to increse this by I dont know ( perhaps some one with aerodynamic knowledge can explain why this happens) I have just lived with it. This traite only will occur at a very low spead when turning so do not worry to much. With the YS instalation I would recomend you use abeam mount as this will help with the vibraton. My current plane is an MK Synergy about the same size as the Beat On this is fitted with a Ys 63S and a Hatory pipe( 631 short I think) with a fixed header this sounds just like it's bigger brothers and is very quiet and is great flyer with no bad habits
Always fly two mistakes high
Kelvyn