Thanks @mijostyn,
bass response is obviously an important consideration: in my case, the bass fires upwards with 360 degress of reflex ports at the bottom. The suspension solution I describe did clean up particularly sub 100Hz bass. The perception of speed is though more a reflection of reverb and attack in the mid treble around 2000Hz than a removal of bloat in the mid bass. The reason I am so excited about the solution relates to resultant better localisation of instruments and depth and clarity of soundstage rather than a shift in overall frequency response. I certainly agree that my findings are entirely predicated by my room and speaker specifics; nevertheless I thought I’d post the experience so that others might explore as well.