JunePay

Okay, so I have a basic knowledge of Junpei and decided to start working on his victory cry combos. Not really sure how to go about it since I can't consistently hit the 2B in his 5AA, 2C, 5C, j.B, 2B...etc. combo. what should I be trying to do to get that to hit?they recover every time and when i try to change the timing on the j.B the dummy gets out of hitstun aswell...I feel stumped.