Similar experience. I have a '66 Lund C-14 with a 2021 Tohatsu 9.8. Alone, balanced, and trimmed, 17mph but 12ish if it isn't balanced. Add a buddy in front, 12mph. And a second, 10ish. Depending on the year, that Sea Nymph empty is 200-300 pounds more than my Lund, so it's like having...