You can add weight to those arrows as well. They make tubes for it, or you can use weed eater line. I always weight my arrows down. For one it adds weight, adds FOC in most cases and I can match the arrow weights very closely.

I shoot a fairly light set up, 26 inches of draw with around 55-60 lbs of draw weight. I do shoot a fairly fast bow though. However I shoot very heavy arrows for my set up that slows the bow down considerably. I shoot 430-450 grn arrows (depends on how they are fletched). I use 2213's with uninocks and I add weight to them by using a length of a 2016 shaft inside them. I found that a 2016 will fit perfectly inside a 2213. So I just trim them until I get the exact weight I want and then assemble the arrows. This why I like aluminum arrows, they are much easier to work with for me.

You are right in saying that it doesn't matter what weight arrow you use the KE will be pretty close to the same. However like we said before with the heavier arrow you have more momentum. KE is only one small part of the equation that effects how well your arrow will penitrate. A very simple analogy is the ping ball/golf ball thing. Have someone throw a ping ball and a golf ball at you as hard as they can throw it. Which would you rather get hit by? The golf ball is going to hurt much more because it is heavier and has more momentum and less resistance to stopping.

There are also some pretty heavy carbon arrows on the market if you look around. And normally cammo arrows weigh a bit more, not always though you need to check when you buy them.

You will hear guys say the heavy arrow thing is bunch of crap and they can shoot very light arrows with good results. Well good for them! These are guys with longer draw weights drawing more weight on fairly effecient bows. They have an overkill of energy and momentum and pretty much any arrow they pick will have enough punch to go thru a deer at normal distances. Many of these guys are overbowed as well, shoot too long of a draw and most likely much more draw weight than is comfortable or needed. Many guys I know could shoot 10 lbs less draw weight and still be effective, especially with the newer bows that are out. However when you are on the line with energy like say 45-60 ft/lbs I wouldn't play the speed game, I would pick a suffeciently heavy arrow to get the job done and limit range or learn to judge yardarge better. I limit myself to 25 yards and use a rangefinder ahead of time to range a peremiter around my stand. I don't have to guess at yardarge, when deer walks inside that circle I know I can take it. The down side is I can't spot and stalk worth a darn because my bow is slow is and I pretty much blow at judging distance beyond 20 yards. Trade offs, trade offs, life sucks sometimes.

Paul