First off Boris, welcome to the forum. Now, for Aluminum vs Carbon, refer back a few pages and read up, also in the Tech forum, this/was being discussed hundreds of time......Also the <font color=blue>Search</font id=blue> tool upper/right corner of the page is great when it's working.

Now for the cock vane/feather up or down, doesn't matter except it is determined by the rest you use. As long as your not making fletch contact to any part of the bow or it's components, it doesn't matter what direction the vanes/feathers face. The key to good arrow flight is to get the arrow spining as soon as possible out of the bow so, once your arrow is on it's way, it doesn't matter the position of the cock fletch.....

Again, as long as your getting fletch clearance, up or down doesn't matter.

Also, Carbon vs Aluminum......both are great arrows.

<font color=blue>Good Luck and Good Shooting</font id=blue>

<font color=red>Rob</font id=red>