Ha! Sorry to ruin your evening.

Actually, when I switch to the .91 FX I am going to add a tad more right thrust. I like to run 13x8 props, and higher pitch props also work better with a little extra right thrust.

As for getting the prop drive face centered horizontally on the firewall, the best gauge IMHO is a long CF rod taped to the centerline of the fuse. The pics below are from another project, but the application is identical for most models. Once the desired right thrust is achieved, just move the engine mount around with the engine attached until it lines up.