Nah! You're torqeing down on the steel sleeve that slips over the bolts
inside the rubber donuts, not the rubber directly. When that's tight - steel
washers on the outside of the rubber donuts against the steel sleeve, the
rubber is compressed the required amount - bolt torque has little to do with
it, unless you deform the sleeve. The mounts and bolts I used (don't know
about others) required the use of a cotter pin so an exact torque is moot
anyway since you need to align the castle nut slot with the hole in the
bolt.

Incidentally, if you're still in the building process, put a washer or two
on the top engine mount bolts and then align the spinner and cowl. When the
inevitable droop occurs, you can then remove washers as required to line
things up again.

Dan Schaefer