Some things I have learned from playtesting- One Yuuki can be enough to go longer than you think the deck can (two is what you really want though), EX7 Yaamon is absolutely the egg you want (games where you struggle to activate it you probably won't win anyway), Nidhoggmon is the only form of stack-protection the deck has (using the trash effect is basically never what you want to do), and the new Eyesmon: Scatter Mode is not good enough, not even to justify running Eyesmon.
Some things I am considering- Going 3 Win Rate 60% & and 4 Yuuki by cutting wisdom training, play 2-3 BT19 Impmon when it comes out.