Never experienced that, the main issue I think that is driving this is the flaps don’t go fully up because of how they go under the fuselage fairing. Some work on the fairing and the flaps nearly go up enough to meet the wing profile. If you set the ailerons level with the flap it has wash-in with drooped ailerons. I set the ailerons by the tip mould seam, for some owners I might even set the ailerons a 1/8” high to add a little more washout. It lands solid like this

Dave