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log the port amd direct injector pulse widths see if the pulse widths actualy drop off if they dont it may be high valve overlap in that rpm range creating a false lean reading especially with boost
as Kode said also check your not hitting load limits at that rpm
check di pulse witchs not over about 6 ms and port about 15 ms max
also check the di pressure isnt tapering off this may mean the di has hit max fuel delivery limits in the table before it hits max pulse width. set the di max delivery to 1 at all rpm
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