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Petey,
Don't mean to start an arguement or anything like that, but using penetration into a foam target isn't a good way to compare aluminum to carbon shafts.
The increased speed at which the carbon shaft hits the foam create extra friction melting of the foam which slows the arrow down faster than aluminum.
An example of this is a 3-D target. You will likely find it more difficult to remove a carbon shaft than an aluminum. This is largely due to the friction the carbon shaft creates.
KE charts typically show a trade off between slower, heavier arrows compared to lighter, faster arrows - they often rate about the same KE.
I've switched back and forth between the two several times - currently using carbon shafts.
The straightness and ease of tuning an aluminum arrow is what I like best about them.
However, I shoot 20+ deer a year, so being able to use the same carbon shaft repeatedly has its advantages.
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