I still can't return to port with under 30k tons. RSRD is supposed to reduce traffic to realistic levels but you can't prove that by my experience. The only change I've noticed is lots more convoys much better escorted. Both are most unrealistic changes. I just attacked a convoy with 2 tankers and four escorts. Was detected on the way in, did battle and sunk one escort. Now I have four escorts above me so another escort from outside has come in to join the party. Six torps left and I have to use them to defend myself, it looks like.
At least DDs are lower tonnage and I won't get much over 30k this trip! I think the traffic is so frequent because people would refuse to play a game where you drive all over the ocean and then come back to base with a full load of torpedoes most of the time. We want action and the number of tons per cruise is sacrificed to make interesting game play. I can live with that.