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Your OAR runs from -1.00 to +1.00. You want to be at -1.00, which means your fuel is good and you aren't getting much knock. +1.00 would mean you had crap fuel and lots of knock. So it sounds like you had 93 octane in it when you switched to an 87 tune...which would cause the OAR to adjust in the proper direction...so assuming I understood you correctly, there's no issue and nothing to see here.
 

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After you flash a new tune the OAR goes to a preset value. Cobb OTS start at -.50. Most tuners start at 0 and make you work to get -1.


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