Twin rudders
work better on modern wide transoms with all the beam pulled back, a lot better, unless you have a ridiculously deep
single rudder. A lot better in any situation....except on a marina.
you have to chose your
trade offs

. Anyway I have one of those
boats with a ridiculously deep
single rudder but the sail drive is so far away from the rudder that the effect on the rudder is very small. Again having the weight more near the
boat due to
engine forward is great for sailing but lousy on a marina.
One thing you can try is to change your
propeller. it is amazing the difference in prop walk among different propellers. I changed mine because someone that should know better said that it would
work much better with my
engine increasing performance....well, no, but increased hugely the prop walk and made manoeuvering on the marina a lot easier. But for that you have to try. The one I use now is a flex-o-fold.