Hey, I have the same mower with a grass packer catcher (plastic). I have a problem with leaf blow out. I'm not sure if it's the bagger itself or if its the mower deck setup or what. If you have this problem, please post here again and let me know, or if you have success post as well. Thanks!
I never had any blow out problems with the machine maybe you need to adjust the bumper skirt on the front of your machine. Does your catcher have holes on th etop of it so you get better compaction. Also think about this. When bagging leaves the cahcher fills up very quickly of you are not running a mulching blade.