I think that swashing motion is inherent of r/c pusher Deltas. I've also observed this in the larger FlyCat along with my smaller Northstar float plane. It appears that the Northstar does it a little less and I'm wondering if the float tips acting as traps make some difference. Back on the spoilerons, I have both planes set up with "elevon mix @ 20 percent of the elevator deflection on a mix switch so I can resume normal flight. The Bank and Yank cornering is unbelievebly sharp, plus on the Northstar the nose gets up at a 45 degree angle on the landings privided I get it slowed down enough to raise it without it climbing.....