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I did think it could be an injector or 2. But they are brand new (well 1000km old now).
Just seems strange considering they're supposed to stop smoking around the 17-19:1 mark. I've heard of them not smoking even at 15:1
They'll smoke at 15:1, someone is pulling your leg.
Dont get too hung up on AFR's. It's not a petrol engine.
If you're unhappy take it back to the tuner and explain what is going on. Try and get it rectified.