Mike, if you ever get a chance to see John Jordan use his hollowing tools it will be of great help. He did a all day demo at our club back in the late summer and that has helped me a great deal. He is known for the wonderfull carving he does on his bowls, but he is a highly skilled in turning and hollowing out his forms as well. I like to turn free hand so his style fits me well. I've used a few of the captive systems with lazer attachments and really don't like them that much. If I turn anything deep say 12" or more they would be of use. I choose to stay less than that deep and turn free hand.
Jack