John, I have had that problem too, but have cured that by using an on board glow driver. I have had that problem with both 2 & 4 strokes.
Mike and I are building this airplane with throttle only and all our options will be aerobatic, loop, figure eight, wing over, inverted flight, throttle control and finishing up with taxi. I thought about smoke but we wanted to keep it simple.
What are your plans for 2015? Hope to see you at the "Nats" next year.
Blessings
Allen