against good ragna,
try to poke him on long range,
jC is your best bet.... to stay away from him
when the round just start, I say don't try to run up to him, let see how he try to get in....
if he jumps in , DP him or 2C or some other AA
if he try to dash in , do 5C or 2A..... or just run away....
B and C fireballs are dangerous, use it sparingly even on max range cause of the recovery
when you do get in, try to make them impatient....
use 6B, 6D, 6A, throw....... jin mixup sucks so make them worry about hi/lo and throw too when you get them in the corner...
rapid from 3C or 6C is also good to get your pressure going if your enemy is not a masher....
if they are a masher just frame trap them.
5C>jump barrier is good for baiting their DP....