What exactly is the symptom? With a better cart - changing from Clavis to Titan - I hear / see / touch woofer behavior changes (method described above: fingers slightly touching woofers, observing, listening). The woofers are more energized, asked to do more. The better cart offers more musical information, deep energy, etc. This "normal" energizing is quite easy to observe - you hear it as you see / touch it, and it is normally a fast movement, the woofer "shivers". Mainly (not always) what you see is what you hear. Sometimes there is woofer movement not clearly linked to sound, but it follows the same main pattern and is probably not serious.
The see/touch (you dont hear it) pumping is different. It is slower, more stately, rather than quick vibrations. It follows, more or less, a "once per revolution" pattern. There is no clear relation to the music, and it is easiest to see when the stylus is in the groove between tracks. The pumping is less observable when music plays, but there is (so far) no indication that it is "turned off", it is still there, but working in the background.