@Drizzt9922 agree. the throw out of sack animation is really annoying, sometimes. I also struggle to sack Matt Ryan, but after doing some repetitions I'm able to get the sack, normally....
how I try to blitz to get a sack: I use Pinch Buck O out of 3-4 odd. I do the following adjustments pre-snap: substitute my fastest LB in at ROLB and LOLB; I use coverage adjustment "show blitz" and move both safeties a bit closer to the middle of the field and closer to the LOS; I user the MLB who is in man coverage and do the LB adjustment "blitz all". if the HB (or TE) my usered MLB covers goes for a route, I follow the route. if he does pass blocking, I rush for the QB. usually, one of the OLBs is unblocked and is able to sack the QB (or at least force a throw out of sack). in the case of Matt Ryan, as I said I most often have to try more than once but it is only a matter of time till I get the sack.
hope that helps. good luck!