As much as I hate to put down my beloved aluminums I will give you that one. From my experience I have had better luck shooting overly stiff carbons than I have aluminums. But still the proper spine is always better. I think it might be because lighter carbons tend to have better FOC than the heavier aluminums.

I will tell you a few other things that make a difference as well, release type, whether you shoot with a string loop or not and the type of rest you use. I have actually found that drop a ways are more critical of spine, not less. And they require a slightly different spine than a prong type rest. My Bodoodle set up properly is much more forgiving of spine than any of my drop a ways.

At least that is what I found in my shooting.

Paul