Hi wize
I don´t know with who you are talking about....but if it´s for me, I just used the 6 upped cards you said us to use.
About acceleration, overdrive cost more, and 1 less quanta on this deck make difference. Also, acceleration will be used only on armagios. Upped armagios has high hp and will block more damage, and mitosed upped armagios block even more damage or can use acceleration. Upped charges for much more damage, and mitosed upped charger do +3 damage.
For me, my deck is good that way.
Edit.: Well, know I saw your post about event card and you allowed 9 upped cards. I would choose to uppgrade 3 life pendulum. And if there will be people who can´t use upgraded card, I would upgrade more cards for my deck.