I don't mean this in a bad way, but if i remember correctly didn't you do some work on that motor to get it to run faster etc..
Do you think that may have contributed?
I was sure envious of the speeds you were talking about with that motor when i was comparing it to what my little 50 yammy was doing.... but now not so much...
Glad it's fixable. Happy to offer you a ride on my little tin boat some day... you just gotta show me how to bang them specks like you do...