The rods are the weak point in the 40V - little twigs compared to the tree stumps in the 32V. The 40V can take a bit of boost without going pop, so a small amount of laughing gas shouldn't be too terrible for it but a progressive controller would definitely be a good idea to not hit the rods with a sudden torque spike.
Turn it up until the rods bend, and then back it off half a click
