Also yesterday on eu1 using a MW nodachi I one hitted georges
Was it held? Did it have a high speed bonus? Did you hit his face?
All of the bonuses stack multiplicatively (aside from the strength/5 bonus), so you could potentially do (2.04)(1.25)(1.2)(1 + whatever the speed bonus is)(0.85 + WPF*0.0015) times the base damage. If the speed bonus was around 25%, your WPF was 111 (after armor reductions), and you scored a solid (no sweetspot penalty) hit, you could potentially be doing 389% of the base damage of your +3 nodachi (before armor reductions), which is the equivalent of an unheld 0 speed bonus 100 WPF bodyhit at 36 PS. That's not including the strength/5 additive bonus to damage, but that's negligible.
If you scored a hit like that on Georges, but only scored average or sub-par hits on generic kuyak-wearing 2h user #673, that would easily explain the difference in hits.