My thoughts would be to still use the required cribbing area and do not decrease due to rubber pads. The rubber pads are just for decreasing vibration and prevent damage to surfaces.
I am trying to convince the homeowner to let me drill a small hole in their slab so I can verify the slab thickness in an area where a lolly column has to be added. Normally only the original areas where the lolly columns are placed get a thicker footing ex. 6", then the surrounding areas get...