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You really recommend copper plugs in a turbo motor? I'd step the plugs down but not all the way back to copper.
Last week I got gas threw in a lucas cleaner and 10 minutes later my A/F ratio dived down to 9's at WOT. Still not sure why that would change but you should look along the line of the fuel system. Is your regulator working properly. Check for collapsed vaccum lines and such.
Stupid question but is your MAF on backwards? You should get an SAFC or borrow a friends and try using that. If you cannot get the A/F's to change then you have a sensor issue.
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