the issue is the location of your pcv port. It HAS to be AFTER the maf. The engine in the crank case is technically metered air. So by having the pcv port before the MAF you are changing the airflow that is being metered. Also: having less than 6" of run between the MAF and throttle plate can cause serious air flow frequency issues which can lead to the maf getting strange readouts during certain conditions such as off throttle and snap throttle.
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are you sure that that MAF adapter is the EXACT same ID as the oem unit? even being .5mm off can make the tune completely wrong on the car. with the fuel trims being like that, I would bet that is your next issue.
4.97 is 5v for a 5v reference. it usually is never spot on.
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