Hi Chris, nice to hear you liked my paper
I think you are mostly correct, except: the force at the nut would be 377 pounds - since you use inch-pounds in, you get pounds out.
Be careful not to load the motor too much when running it overspeed (36 V). Remember that power = angular velocity * torque, and the motor is not made to produce more than 1/8 HP or about 92 W. So while running at >2500 RPM, I think you need to derate its torque/current capabilities. But I guess it should be able to take some overload, though... Here we could really use Mariss' (or some other expert's) comments; I'm a bit uncertain.
Arvid