So here's the scenario with the setups.

I had 8 CSX arrows that I messed around with the Turbo nocks on. Decided to fletch them with the quick spins instead of my CF extremes because I didn't want to add any weight to those for the 3d stuff.

Arrows
PSE CFs 4"duravanes @ 370 grains finished
CSX quick spins @ 410 grains finished

Bows
Patriot Dually
Martin Cougar 3 Fury cams

Ran both bows @ 3 different weights

Pat @ 50-55 and 61.5 (maxed)
Cougar @ 55-66-and 71.5 (maxed)

Now I was under the impression that a bows KE, regardless of arrow weight, wouldn't change much (all else being equal) more than 1-2.5 pounds.

I've run tons of arrows through both these bows and never got a KE change of more than 2.1 foot pounds... the heavier gaining I would guess because more energy absorption. I thought this was pretty much in direct correlation to a bows effeciency and couldn't be changed much without weight or drawlength additions. Am I O.K. so far??

But with the quick spins... 4 and change KE increase nearly across the board? Are these that much more aerodynamic and/or effecient?

I'm in the process of refletching a few of the CFs now so I can compare apples to apples but I'm wondering if anyone else has noticed this or if I'm on crack.