Hi Tommysta....
I have a d-18 from Ziroli that i am going to build.
114"span with two zenoah 38.
On the drawings Mr Ziroli write.

scale thrust line is 2 degrees out thrust on each engine including
nacelle.
Flight tests have shown that for easier take offs right thrust is required. Reduce left engine to 0-1 degrees of left thrust and increase right engine to 3-4 degrees of right thrust.
This will reduce torque taking the d-18 to the left during take off.

I don't know if this is fore all twins or just fore the d-18.
Hope this was helpful.

Ketil