When I feel that a ragna is getting desperate, and its getting ready to ID on wakeup, I notice that throwing out some J.D's or 2D's at the right time work pretty well, especially if you have heat, if a ragna ID's on wakeup, a well timed J.D will give you a free Counter-hit, it also works if he tries to wakeup and grab, if he does decide to block however, you can just RC the J.D into pressure.
ps. most of the time, it'll still work even if they RC their ID, you probably won't get a counter-hit, but you can still combo into a 2A, and get a little damage in.