First of all, thanks for all of the input. Here is the scoop.
As is often the case there are/were multiple variables contributing the noise related to my carbon shafts. First I increased the brace height another 3/8 of an inch. I'm now just shy of 8 inches. That made a difference in the noise level of both the carbons and the wood arrows. Second, I ordered some 3 GPI weight tubes from 3Rivers and installed them in the shafts. This also reduced the noise level of the carbon shafts. The weight tubes, however, seemed to change the spine of the arrow slightly, so back to the bare shafts for a little more work. Building out the rest seemed to remedy that. I believe someone had suggested that earlier in this thread.
I have yet to mount and shoot broadheads on the shafts but I will probably tackle that this weekend. In the end, I think I have gained the following:
1. a slightly lighter, flatter shooting arrow - I went from approx. 600 grains to approx. 550 grains total arrow weight.
2. a more uniform shaft (obviously)
3. significantly higher FOC (good?)
4. cheaper - I don't have the time to make my own arrows, and I broke 3 wooden arrows made for me by whispering wind last year - great arrows, but cost about $12 a piece
5. better penetration? evidence from others seems to suggest this will be the case
So was it worth the time? Yes, but not because of the benefits listed above. I have a lot better idea now of what variables affect arrow flight and performance.
In fact, in the end I may stay with the wooden shafts. Not because of how they smell when they break, but because I have a better idea now of how to get the most out of them.
Thanks for all your help.
46r