Mech too heavy for hinge?

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#1

So I have a mech that uses a hinge constraint to turn its body.
However, the mech is seemingly too heavy, as this happens:

as shown in the video above, the mech’s hinge bugs out and becomes wonky for seemingly no reason.

I have tried to fix this by increasing the max torque, lowering speed, messing with other properties like density, etc, and nothing has worked.
Any help?

#2

Under Part settings you could try enabling massless for all of the parts that you want to move. Also consider trying tween over constraints - those tend to be more smooth

Difficult to give a better answer without access to the model & the limited preview shown in that video