I have not dumped anything on 7.55 yet so I don't know why it's not giving you the sfo's in your dumps but you can get them from the retail games without having the passcode because they are not encrypted.
Just use PS4PKGViewer.v1.5-LMAN just load the retail in that and pick extra extract pkg and it should give you everything that's not encrypted and the sfo should be in there.