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@Nezil Stock tune runs a lot richer and slight less boost which is why octane holds up better. OTS lean out to low 12s, the N55 golden rule, for more power and that's what proper 91 can handle.
You can't really expect any company has an OTS for aki87-88...
A custom tune can tweak AFR down to save your timing. But there is a balance point in such tradeoff. It's not easy to know if it's worth it power wise. N55 power is very timing sensitive, and is very AFR sensitive too.
Your car with your gas is very difficult to tune is what's happening.
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Lemania 2320
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