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It is too lean. Get your chip adjusted or get your DME adjusted. Run premium gas; make sure yiur DME is set right; i think there is also a California smog wire you need to disconnect (use search, I can't remember the details); get your AFR into the 13 or 12.5 range at peak torque. You are way too lean. I think the DME may retard spark if it detects too much heat, too, so that could be a factor if you are so lean you are overheating the engine...not sure, it has been a few years since I had a Carrera.
You should get more out of that engine if you have everything set right.
Check plug gaps, too. And air filter, etc.
Good luck!
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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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