My boat is a Cape Cruiser 23 Venture with twin Yamaha 50's. Its hull is identical to the C-Dory 23 Venture. My boat has fewer interior amenities and may therefore be a little lighter than the C-Dory version of the 23 Venture. Whatever the case with initial weight, I have run the boat with a lot of extra weight in it. We did a 2,000 mile Inside Passage trip with two people and enough supplies for weeks (including Alaska Series dinghy, Honda 2000 generator, extra anchor and rode, extra stove fuel, and off-shore life raft.)
Here are a few observations on how the boat does in significant following seas.
1. I've never had a problem with bow steering. In fact, I usually feel more comfortable (mentally and physically) going with with heavy seas, than into them. Maybe it's just out-of sight, out of mind. I do remember my wife asking me once if she should be scared when she couldn't see the sky out the back door. Or maybe it's just the exhilaration of "surfing" that reduces the fear. Be that as it may, I've never buried the bow in the next wave and never felt close to a broach.
2. I adjust my speed to conditions. One of the nice characteristics about these hulls (I have also owned a 16-foot C-Dory) is their ability to maintain control at slower speeds than can a lot of other boats. These relatively light dory style boats are also responsive enough to allow quick throttle adjustments as needed.
3. I know this is slightly heretical to many, but I don't have trim tabs. I prefer moving weight around to balance the boat. I feel it's important to get as close to lateral level as possible when the boat is not moving. Under way, I try not to rely overly on engine trim for bow control. I move weight forward and aft as conditions dictate- both for sea conditions and as fuel and water weight change (the water tank is under the aft passenger seat on my boat). I actually pack with this weight transferring in mind. Two big water proof duffle bags are great for quick weight adjustments. I'm not unalterably opposed to trim tabs. So far, though, I feel more comfortable operating without them. Both trim tabs and hydrofoils have diminishing effect at lower speeds - but see the next item.
4. I just had Permatrims installed. I have to say I love them. We didn't have them on our trip to Alaska, and I never felt like I couldn't control the bow attitude with just weight transfer and engine trim, but these things are really nice. The response to small adjustments is remarkable. I really think they will enhance control in heavy following seas. They are also great for dealing with a strong crosswind. Even when the weight of the boat is balanced, a steady side wind can produce a list when the boat is going at any kind of speed. With the Permatrims, I find I can maintain a more comfortable attitude at a reasonable speed by raising or lower one of my two engines just slightly. I just need to practice quick throttle and trim adjustment with the new set-up to be ready for the next surfing adventure. With the Permatrims on twin engines, I seriously doubt I will ever try trim tabs.