I don't know about Suzis, but the Etec tabs are handed, so even in the straight ahead position, there's still a slight correction applied. I have mine set to the neutral position. There should be some info in the owners manual, failing that, the rigger should have set them when the engines were installed. Make sure that if you have to run on one engine, with a "dead" engine tilted, you still have full steering movement & that the engine cowls don't clash. When you tilt an engine the geometry changes, so when you have one down & one up, they don't move at the same angle in relation to each other, if that makes sense.
Rule#2: Never argue with an idiot. He'll drag you down to his level & then beat you with experience.
Rule#3: Tha' can't educate pork.
Rule#4: See rule#5