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I assume you are reading AFR at the exhaust. So, it's going lean on decell or trailing throttle? I'm not sure I would be concerned at all with that. The only numbers that really matter are steady state throttle and under load. How do these look?
Not quite the same animal, but my 3.0 liter MFI motor, with its very healthy cams, goes to 17:1 or higher under trailing throttle. As soon as you even tickle the throttle, however, it goes right back to 12.5:1 or so. With 85,000 miles and God knows how many track days, it's still going strong.
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Jeff
'72 911T 3.0 MFI
'93 Ducati 900 Super Sport
"God invented whiskey so the Irish wouldn't rule the world"
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