"Man, this is a 20, it ain't a crew-on-holiday, adjust it with a hammer 18 :-)"

Hell, it's just a boat with two hulls! And my crew's usually more on the ball than me - no vacations for them, matey. I also gave up adjusting with hammers and moved up to adjusting with NACRAs. That was not successful... ;-)

I used a system similar to the stock 20 design for forcing rotation on my 18, simple, not great, but again I only had to mess with it in light air (like other boomed boats I've crewed on). The only boats I've had to use forced rotation as a matter of course in all conditions have been boomless. Sounds like the 20 needs the forcing more routinely...