We are going next month to Epic, it's our first time and we need a rope drop strategy. We do have express pass for the day and early entry. Should we go straight to Dragon Racer's since that is the only ride w/out express pass? Or should we have to Super Nintendo first?
Yes, if you really want to do it, or the Toothless meetup, or if you want too do Mine-Cart multiple times. However, decent chance Mine-Cart won't open first thing. Actually decent chance Mario Kart also won't open first thing... Dragon Racers Rally is a carnival style ride, so if you don't manage to get on it, it's not a big loss.
Whatever you do, make sure you are able to stay through to closing. Good chance you will be able to reride even the heavy hitters with less than 20min standby wait in that last hour.
Super Nintendo World has super high waits in the morning, but the wait times drop significantly in the evening. I would hit Isle of Berk first if I were you.