Hi, edfowler. Much of the glare and other sonic anomalies from loudspeakers results from higher-frequency, acute micro-vibrations that you can't really feel or readily detect. Best results are usually determined by what you hear by audition, not necessarily what you can or cannot feel at places other than the speaker baffles.
Racquetballs, cork-and-rubber, and Moving Men are all rather poor loudspeaker isolation materials. They can provide satisfactory results in some circumstances, depending how they interact with other aspects of the system. Audition and sonic results are what matters; so whatever works to your satisfaction is of course okay. Usually, with appropriate, efficient isolation materials you don't need to build up so much of a totem pole or Dagwood sandwich to set speakers on.
Using "Thin" Fat Dots instead of spikes between the speaker bottom and steel plate of the outrigger should provide an improvement. This won't rigidly anchor the speaker to the plate but won't allow any more wobble than the spikes do. Or, instead of replacing the spikes with Fat Dots, use a Herbie's Hush Puckies grounding base under each of the spikes.
I'm wondering if the speakers' tendency to rock or wobble is because of the racquetballs. You'd be best off to ditch the racquetballs in any case and use Big Fat Dots instead, or just ditch the weights. These speakers will probably perform optimally with "Thin" grungebuster Dots between the speakers and outriggers, and either Giant Cone/Spike Decoupling Gliders or Giant Fat Gliders between the outriggers and floor.
With tall, narrow speakers like the model 6s, you'll usually have some tendency for the cabinets to rock or wobble if touched or pushed on a carpeted floor. This is usually no problem because the speakers won't wobble on their own--they'll usually settle onto the carpet and perform perfectly well if supported with appropriate isolation materials.
A Hal-O JR (or HAL-O Mini Jr.) damping instrument placed on each body of the BFA posts will help with speaker wire vibration. Mini Jrs. placed incrementally along the cable length will help, also. Instead of damping instruments, wrapping Teflon plumber's tape or rope caulk around cables incrementally along the cable length can be beneficial also.
Herbie's Audio Lab