Hello CSTEVEC,
I am using a OS 1.60 in mine and this engine pulls it right along.
I did put in 2 Degrees Right Thrust and 2 degrees Down Thrust on the enigne mount . I made the shimes out of wood. I didnt use washers . One thing you might do is reinforce the engine box on the front of the Fuse.
Also for more handy hits check out the thrreads from RED7FITHY. Red is just starting IMAC and theres a lot of Ideas in the post that might help you.
Its a great smooth plane but wont do T/Roll or 3 D due the the elevator being too small.
NEDYOB