Good on you! I think getting a great result from experimentation is wonderful. I'm very happy for you that it worked. I'm going to venture out on a limb and say that you would not keep the same sound if you spiked the table and floated the armpod on the footers. I expect there is resonance in the TT you are dampening/sinking (the reason why people in plinth-world make bigger/heavier/better plinths for the SP-10Mk2), and the improvement on the armpod came from a) switching from blutack to spikes, and b) taking out the symposium (two isolation methods next to each other is usually worse than just one in my experience) - both of which should have improved things.
I expect that if you do not hear any issues with the fact that the table/platter is now theoretically resonating at a low frequency in relation to the tonearm pivot point, that the experiment has been successful. Once in position, the table itself has a great deal of inertia (in 3-dimensional space), which should help keep most of the resonance transfer in the domain of heat generation rather than low frequency movement. Remaining theoretical issues might remain just that - theoretical.
I have a couple of motors like that and some great footers made by Sony way back in the day. I could try that relatively easily if I could make an armpod. I'll have to think of a way to get one done...
