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You'll probably see great gains from keeping your turbo's wastegate open during lean cruise. You can open that throttle wider while relieving the exhaust path.
I'm running a closed loop 17.4:1 ratio right now and it's working out pretty well. No pinging to speak of and power delivery is smooth enough. I'm using an AEM wideband gauge with some custom circuitry to lie to the ECU. I can train the ECU around two different variable AFRs with the flick of a switch.
Don't worry about the emissions. Even during lean burn, your 2.0L will produce fewer NOX compounds than your average V6 family car. If you look at total NOX compounds produced instead of PPM, they're rather low.
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