Jerry

We cant the hulls on our products, we originally didn't but found that in choppy conditions, water would climb up the outside of the lee hull when flying a hull quite high, this would catch on the outside of the rear beam and you could feel the boat judderring over the waves. We canted the hulls and it stopped, we could tell no difference in the behaviour of the boat in any other way, so we ran with it for this gain only.

I will try to answer your points

How much cant: 4 degrees did it for us

Benefits see above, the gain in choppy conditions is certainly no more than 1 %

Drawbacks no measureable difference in tacking, boat feel, two hull in the water sailing, only drawback is it costs more to build.

conditions for benifit, upwind choppy conditions only

no drawbacks

effect on tacking/gybing nil

Impact of different hull shapes: I can only comment on ours,

Cant rudders as well? we fried it both ways and could not tell the difference.

Is it advantageous? well we found that in one type of condition it is for us, and with no downside it is worth it.