Looks a little lean for a SRR plot, on a chipped Pre96 ECU.
I would expect it to be 10-10.5 on the rollers for a generic type chip, which is can be 11-11.5AFR on the road.
MAF may need a clean and the slightly leaner mix would account for the slight increase in power over what is expected and as simon mentioned a little bit of det causing the timing to be pulled as touch.
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