Bob, thank you for the tips on things to check inside on the steering. Everyone else, I'm still interested in anything about centerboard control from the rear seat.
It's true the barber hauler seems more of a problem on theTI--how to rig it that is.
OK I also have to confess I've spent a lot of time trying to make various boats go fast, and used the barber hauler on the AI at times even on a close reach, to just slightly move the clew of the sail outboard a little. It's the same effect as you get with a traveler on the H16, or many other boats.
When I look at the TI's sail, in any kind of breeze, on most reaches, I feel I would have less weather helm and at least marginally better speed, and not have to roll in a reef so quickly--if I could just lead the sail clew outboard some. It's a bigger sail, the mast bends off more, and the whole shape deforms more quickly than it did on the AI. So that's a long way of saying I can be the sort of finicky person who would use the barber hauler on reaches as well as runs. Not for everybody I know.
The other thing that bothers me is the interaction between any barber hauler and the up and down play in the amas caused by loosely fitting akas in the main hull sockets. I raised this question in a post next to this one. If I use the barber hauler on a reach, the tension is going pull the stern of the aka up 6 inches or so.
Anyway, thanks for the tips. I'll chime in again about the barber hauler if I do anything interesting about it. But I may fool around with some TI3 ideas before going too far with anything.