Dgob, all elastomerics have a range of operation- a minimum loading and a maximum. Depending on where you get the elastomerics you can often get a datasheet that can be very helpful in this regard.
In my book, stabilizing the imaging is a major improvement! One of the weaknesses many 'tables have relative to analog tape is image stability. I really could not get my 'table to do that as well as tape until I installed the solid plinth (damping the original plinth, which was hollow-cast, was not enough!).
However, I did increase the weight of the armtower to over 6kg and this brought no major improvements - save stabilizing the imaging.
In my book, stabilizing the imaging is a major improvement! One of the weaknesses many 'tables have relative to analog tape is image stability. I really could not get my 'table to do that as well as tape until I installed the solid plinth (damping the original plinth, which was hollow-cast, was not enough!).