I do not use any of the strap type mounting.
Hanger 9 kits are noted for that.(junk)
Didnt like the rascal engine mount setup neither.

I mount all my engines direct either by bolt and lock nut or
by tap and drill and bolt and backup nut.

747: These experienced guys has tried to guide you in the right
direction. If things dont go like you think they will then
Just do one thing and report back to us when you trash
you new rascal. So we can tell you we told you so. LOL [8D]