I'm very sure Konami still does that dirty trick where most players gets their game rigged while a few don't (just to make it as if not everyone had it happen to them), all for that illusion of "challenge".
I mean, what's the chance that FOUR DUELS IN A ROW, I failed to farm lv60 just because I NEVER get the right hand? Whenever I have Spirit and Astral Barrier, I have no monster. When I do have monsters, I don't have one of the barriers.
Bricking that often, never happen with lv40, so I'm sure they specifically rigged just the lv60 duel.
Maximizing the points you get so that you can finish the event faster and start focusing on leveling your character via dueling the lv10 version with 3x multiplier and exp booster.
Why farm lvl 60? Im way over event endpoint just by doing lvl 40 basic fights against him. Besides, considering this fight looks particularly BS and it doesn't drop better rewards then lvl 40, there isn't really a point.