Lets break that combo down shall we?
CH 2B > 5C
You have to delay the 5C a bit depending on how high your opponent was when hit, usually you want them to fall into the highest part of 5C.
236B > 2A
Hit the 2A as soon as you recover, at certain times you can't use 2A so just use 5A instead.
2A > 5B > 2B
This is the hardest part of the combo but this is how you do it.
When you hit the 5A/2A (Yes this applies to 5A too) you delay the 5B > 2B, do the the 5B > 2B as fast as you can.
It should be like 5A/2A small delay 5B > 2B.
This applies to all 5A/2A > 5B > 2B combos.
When I figured it out my ratio with it went from 70% to like 95%.
Still takes practice but you can do it.