http://forums.pelicanparts.com/porsche-911-technical-forum/452853-motronic-tuning.html
The above thread has some detail about the CA wire and the DME settings you can make yourself. Be careful with changes - you do not want to introduce a scenario where you damage your engine, so take it slow.
You also should check your fuel delivery overall: plugged filter? Etc. For some reason you are lean.
It comes down to two dimensions: timing advance and fuel delivery in combination to get you where you want to be.
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Emery
1988 930 coupe - Silver Metallic
TurboKraft 3.3L 8:1 CR, SuperSC Cams, GT35R, B&B Headers, TK intercooler, Tial WG, ARP, tecGT based phased sequential EFI & ignition, Wevo shifter/coupler, ... 
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