Adequate Frame Torque

Every time so far I have had to move my VCore 3.1 around, I have had its bed alignment get fairly uneven (up to .6mm shifts). After which, I have to do the painstaking process of realigning the back corners through untightening, nudging, and retightening the top front corners to compensate. Is the frame on the 500mm printer just too weakly bound to actually withstand being moved? What level of torque do I reasonably need applied to the bolts that bind the frame extrusions and corner plates together so that they won't shift when moving?