Thank you Dave for your advice. I will add a washer between the mount and firewall. and Test fly it.

But i am concered that i am trying to correct the problem by other than finding the real source. Shimming the engine might seem to work but the real problem could be the angle of attack of the Wing. How can i make sure that i am square with respect to the angle of attack before porceeding with correcting the engine down thrust angle?

But probably due to the ease of adding washers, i will go for that first.

Thank you again for your response and input.

Fadi