Main jet is not 125 but its 130.That is a very valuable info. I will try that and let you know the result. From my research, i found stock runs on 15 pilot jet and 125 main. Please correct me if i am wrong. I think 17.5 will be perfect. May be that is the reason you are getting correct AFR on 2.5 turn.
With 17.5 I get correct AFR with 2 turns