Well, I can later take Eyes of Divination if we go 10th or past that level somereason. I think playing chuunin exams may take months RL time :P. Also we can think/discuss a proper Kaigan techniques as you dislike the only one ever published (just keep in mind it's learned kinjutsu which was created to counter doujutsu users from Konoha). I would imagine good setup is to several rounds 'observe' target and then you could get same number of rounds power boost as you can predict their movements in the conflict.