90 ftlb should be quite adequate if the threads were lightly oiled.
I'm a little confused on how you measured 2 thou deflection. Can you show the setup and where you were pushing? Was the head raised all the way up? In any event, push on anything hard enough or with impulse -and it will flex... The other day, I had a 4" diameter shaft of 1045, 2.5' long chucked in the lathe and supported at the tailstock. With a DI at the chuck end, all I had to do was press with one finger at the TS end, and I could see a slight deflection. The shaft still came out within a thou from one end to the other... With your machine, the real test is to mill some metal and see if it performs as it should.
Good luck.... There's getting to be a lot of 932's out there and it's a very popular machine. You done good...
Ray