RE: Questions about Arrows, Speed, etc. etc.
There are only four ways to increase speed with any signifigance. This is assuming your bow is properly tuned. Loose weight on the string, loose weight in the arrow, add poundage, add draw length.
So if I were you and wanting to increase speed and not worried about noise I would remove the brass nocks, remove the string leeches, make sure the loop is as short as possible, loose the peep sight and install a no peep, and get lighter arrows like Gold Tip ultra lite 400's.
You could increase your poundage a little but leave your draw length alone.