I'm no pro archer but the length is affected more in windy conditions. Many tourney archers will use full length arrows in indoor tourneys but used cut arrows outdoors and for hunting. I use a whisker biscuit and love it. It will wreak havoc on your vanes after a while but that is definately woth the security of the biscuit. Biggest problem I have when doing spot/stalk is to make sure your arrow hasn't gotten pushed down into the bristles of the biscuit. Before making a shot make sure your arrow is up on top of the bristles.
(there's no smilie for crying!)
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