At the time the points open as you rotate the flywheel there should be a windoew to see the points at that time. I mark tdc and a advance mark on the clutch side and make a little pointer out of a toothpick stuck in modeling clay attached to the case. Rotate the flywheel while you hold the clutch side at the advance mark until the points open and then tighten the flywheel. Recheck under better weather conditions with a cig paper between the points and pulled out when they open. Maybe you just need some food and a good nights sleep before the next attempt.