I ran over to HD at lunch, and got a 12-pack of the Clear 3/4" Sqaure Feet for <$3.00; if it works, I have 2 more sets to give to friends as Easter/Passover gifts... I'll be a hero!
I don't know if anyone mentioned this:
I got a noticeable noise reduction from adding one of those "skins" that they sell at BB for $10. My white Falcon Pro was ugly in my AV rack, so I picked one up; the thing is made of thin foam-like material, which definitely deadens the sound. It does not seem to make my Falcon run noticeably hotter, and the feet mod should now compensate with increased airflow.