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It'd be worth while to have a wideband O2 put in the car for tuning or all the time.
If your looking at WOT values try and target 780-840 range (mv) (On narrow band) for now.
What are you reading/scanning with? Direct Scan? ScanMaster?
I'd also double check spark energy out of that OEM pack/module.
What plugs are you running?
Sounds like a fuel or ignition timing issue.
Double check your Cam Sensor phazing as well.
Just a couple suggestions.
~Scott
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86 T-Type (wife's nice car) TE 63,Front Mount Custom Interior,Midnight Blue. *being completed*
Painted: now going together!!! 
86 Camaro 3.8L Hybrid 10.32@133mph 93oct pump gas through the mufflers Drag radial tire
18psi boost *TH400w/brake .76mm turbo,5"DP,Champion head/intake Ect. 
1992 GMC Typhoon (wifes daily driver) FPR,Double GN FMIC, Splayed 4bolt block,nitrated crank,Eagle rods w/ SRP pistons> Vortec heads.Custom camshaft 61dbb turbo.
98 Jimmy with left over Typhoon parts. Marine 4.3L intake conversion... I'll bet it's in the 13's 
89 Nissan Maxima GN TA49 turbo stock GN intercooler, stock Nissan 3.0L with 244,000mi and counting 13.40@107.mph
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