Abufletcher- the left wing(s) appears to be twisted. The LE of left near the tips is lower than TE relative to the right wing(s). Parenthesis used only because the upper wing is the one I'm basing opinion. Block fuse, loosen rigging and 'X' bracing, jig lower panels, set the 'X' bracing then re-rig. Since it has fwd stagger the lower wing needs ~1/8 to 1/4" more incidence. If it was my airplane I'd rig the TE at tips to have ~1/8 to 1/4' washout. The SE has a longish nose so right thrust doesn't need to be much. The right thrust is only needed for take-off or sudden burst of power, as you well know. I don't wanna 'preach to the choir'!