Ken,
"Could you elaborate on your preference for the RE?
That may be something I am seeing, but I just don't have enough experiences with these type bows to know what I'm missing or experiencing."
It's a "feeling" issue for me. Much like if you were to hit a baseball with a hollow thin wall pipe (bamboo) you can feel the vibration in your hands and it keeps buzzing but if you hit that same ball with a solid dowel rod or baseball bat it's just a good solid thump. I know people say they cannot feel the difference in core woods but I can.
I don't know if it's the physical make up of bamboo or what but I know what I feel. It just seems more solid to me. Just like the pipe anology, the EMT is quicker in the hand (boo) but the bat just seems more balanced and powerful. Again this is all my personal opinion but I feel it in all the bows I have tried and I have yet to shoot a boo cored bow that I truly loved, there was always that "something" that never sealed the deal, now the elm , maple and action wood cored Bows seems to have the solid feel I like.