It seems yours moves opposite to mine Bill.?
More twist on the blade makes my blade move toward the rim on a 4x6's wheel (more strongly at the bottom than at the top).??
Retracting your bottom guide will twist the blade more (twists through the same angle over a shorter distance) and your blade moves away from the rim.??
Whatever, twisting the blade definitely affects where the blade rides on the wheel and as long as there's clearance (or at least no pressure) between the blade and the rear support roller, the act of cutting pushes the blade back without any tendency to derail - jv? ??