I'm not sure that's it TrOjAn, unless I'm not understanding your Eureka moment.
You can't be one tooth off on the crank gear, only one tooth off on the cam drive gear. As long as the crank is in the correct position when you line up the cam drive gear, that should be that. It can only be wrong if the crank was slightly off the mark when the cam drive gear was lined up or the cam drive gear timing marks were not parallel with the head surface when fitted.
Looking at your second photo down, if the alternator rotor mark was lined up with the case joint when this photo was taken, then it looks like you are one tooth out on the cam drive gear not the crank.
I hope you have a nice warm garage to work in, tomorrow's gonna be bloody freezing. Good luck.
