I take it you didn't ask Kevin about this. The bases are specifically made to eliminate the use of footers, cones, pucks etc. So, if you do use them, you will be compromising the design and purpose. Now, this isn't to say you may not ever like the "sound" better using a footer as a tuning device (not likely but possible), but what it does mean is that you may not like your component when the sonic effects of the resonance have been eliminated.
Of course if you have the puck/cones, you can always try it both ways, but in my experiences (and I own 4 isoBASES) you really don't need them.
Of course if you have the puck/cones, you can always try it both ways, but in my experiences (and I own 4 isoBASES) you really don't need them.