Normal
Not much, really. I actually prefer using 2 or 3 three balls to get some extra orbs in reserve and then just hit the queens chamber when I'm down to one. Keeping a controlled multiball with one ball trapped assures not getting a double drain. As far as mid-game strategy, it really is just wash rinse and repeat- use multiball to minimize risk of knocking down orb drops to get more orbs in reserve, and hit the chamber when you have one in play. The bonus collect in the upper right can be a huge opportunity, so trapping on the left flipper and timing it with 4 or ideally 5x is great. I love Centaur, but once you have a good ball going like you described, it can get repetitive.