Do Plugged Virgos sound better?

I recently set up a pair of Audio Physic Virgo IIs and was having a hard time controlling a mid-bass hump. At first I used them on the carpet without their spikes, but when I spiked them to the floor the sound (and the bass) did not change all that much. I tried some other measures, messed with positioning and subwoofer settings on my Servo-15, etc., but still could not entirely rid myself of that boom. Then, on a whim, I plugged the bass ports with some rolled up foam. That actually seemed to help reduce the mid-bass boom and tighten them up a bit. Now the bass is pretty respectable (has good articulation and solidity) over a wide range of recordings. So for me, plugging the Virgo's ports worked well in my room. Have others done this, and if so, how do your results compare?

I used to have a set of B&W CDM 9NTs that came with foam port plugs for exactly that purpose, so that's probably why I thought of it.