It's hard to give any meaningful advice without seeing your room and what your Scoutmaster is sitting on.
FWIW, my Scout sits on an old Sound Organization stand (light steel frame, 18" high and simple wood shelf" and there are no footfall problems at all.
The Ginko probably filters out higher frequency vibrations effectively but not the very lowest, which is where your problem seems to be.
You're just going to have to experiment; try moving the TT to another shelf/stand, etc.
FWIW, my Scout sits on an old Sound Organization stand (light steel frame, 18" high and simple wood shelf" and there are no footfall problems at all.
The Ginko probably filters out higher frequency vibrations effectively but not the very lowest, which is where your problem seems to be.
You're just going to have to experiment; try moving the TT to another shelf/stand, etc.