Rich on WOT

An AFR of 14-15 at cruise is NOT too lean. I adjust for 15-16 AFR at cruise for the same engine type; lean burn engine AFR's were in the 18-20 range. So IMHO you are richening up the cruise for no good reason with the larger primary jets. If the 65 primaries put the AFR in the 13 range with the throttle opened to around 1/2 to 2/3 at 60-70 mph, that is good.

That larger primary jet may not be the whole cause of the overrich WOT but it is not helping.