Well, it is usually the simplest solution as many of you pointed out. 14s battery arrived today, bike fired right up. ]
Well done. At the very least you get to go on the NYD ride
Notwithstanding, I doubt it was the 14s battery that solved it. You mentioned that you had tried to jump start the bike from (lI assume) a good powerful battery. In this case, the 14s wouldn't have added more juice than the other powerful battery (also assuming that the jump leads were tightly secured both ends). Possibly, the flooding cleared by letting the bike rest.
Anyway, it's good that you replaced the 12s with a 14s.