I may have been running some extra overhead in mine. But going from NJ to CO last year the only time I changed jets was when I ran out of states that sold 94 and was getting 91 octane. Upped it one size just from caution, no det.
Try the larger jet and see, though I wouldn't have expected a 20* difference to require it. Maybe you were on the border of too small a jet to begin with.
If you aren't running max pressure (a 2c or 2d at factory pressure setting) you could up the pressure of the system as well.
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