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The dyno O2 sensor will be exposed to more ambient air and is after 1/2 cats depending on your exhaust configuration so it will read leaner probably by a good 0.1-0.2 AFR points minimum. As for which one to trust, that's down to you. I've heard reports recently of someone I know having 3 sensors in the exhaust pre-cat (inc. 1 OEM) and one in the tail pipe. They all read differently, so again, do you trust 1/none/all??
Feed it back to James and see what he says. So long as its not knocking I don't see an issue so long as you're not lean at the top end, which you're not.
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