Thanks folks. I wish I had room to move the speakers out...I'm in a tiny apt. I actually tried the bananas. Using the tip I read here of placing the positive on high and the neg on low makes them not stick out quite as far, and they seem pretty stable.
Side note. It's a funny thing when you get 2 new items on the same day. I got the aforementioned new speaker cables, which replaced 2x6' lengths of 19 year old Monster wire, and an Arcam Solo, which replaced my Cambridge Audio 340A. The sound is much fuller and nicer all around. I just wonder how much of what I'm hearing is the Solo, and how much is the cable! I see now it would probably have been more interesting to replace the old with the new incrementally, as to fully appreciate the changes.