You woudn't have happen to be at Kelly Park this weekend were you?
I have a classic 14 that has about a max crew weight (for cruising) of ~400 pounds. It moves along, but is pretty slow. I've sailed a friend's turbo 14 with close to 400 lbs in a "very" stiff wind and we were moving. Got a hull up (not very high) before we pitch-poled over during a tack. Have to be very careful of weight distribution on the 14. On that same turbo 14, I've put 3 people on it (~550 lbs) and was able to sail up and down the river on a light wind day.