- The hard mount setup provides "mass balancing" - If the firewall and fuselage structure is well designed -it prevents the engine from moving -- the reaction forces are simply absorbed by all the mass -
Improper mounting is common on single cyl setups. long legged standoffs are at the front of the line.
Maybe you can't twist em -but twist -they do.
the best standoffs are still maple blocks, thru drilled and pulled solid with long bolts .
then - two sides bridged with thin ply plates.