Ok just happened to be watching the Korda Masterclass Low Stocked Pits and noticed DF demoing this rig, you will notice from the image i have attached he is no longer incasing the D inside the knotless knot and appears to go around the outside of it
I can second this, i find this happens more when the bait has something like a piece of fake sweetcorn on top, people think it makes the bait sit up from my findings it kicks out at an angle. 10mm avid highlites are great for snowmen be warned there very buoyant though