I know that 5 AW is enough for all Titans being played, but including a 6th not only makes it possible to replay a rewinded Titan, but it also helps getting the combo out faster. About the combo, I also found that the optimal catapult amount in a 30-card deck is 4. So changing the 2 gravshields would help dealing with RNG issues, but it also sacrifices a bit of defense. I also like varying Accelerations and Gravity Pulls.