Star Sound Apprentice platforms

Try putting the amp and stand directly on the floor. The wooden dresser may be the culprit. 

t_ramey, did you try the 103 or 104 under your monoblocks? I am revisiting isolation in my main system and have stacked another Symposium Svelte Plus shelf onto the existing Svelte but have found that some mass loading in form of granite slabs did add more authority to the music (I avoid to use weight description).  The amps are coupled with Symposium Big Footers. 
I may try Symposium  104 stands directly under the amps and no slabs.