I'm fine tuning my Intruder for SPA, and while adjusting the CG yesterday I found a strange (to me at least) phenomenon. When I rolled it to knife edge, if I needed right rudder it would pull to the canopy, but if I needed left rudder it tucked to the gear. I suppose this has to do with the spiral slipstream effect, but is it something I can or should trim out mechanically before setting up a mix to fix it?