Making props respond to low gravity

My props don’t respond to sv_gravity, no matter how low I set it. Physical Properties also does nothing. I even tried WeightSTool. Still nothing.

Is there a way to make props respond to gravity?

phys_timescale ###

It seems that all non-custom props cannot be zapped with Physical Properties…

The only thing that I can think of that is low gravity, is to weld your items to a hoverdrive controller.