i asked gunthr about the 2%/60% thing and he said use 2% for coins that are crap and will go away eventually and use 60% for good coins.  If you don't  know what i mean by that then i'd say good coins are coins over 1 year old where the price in bitcoin is near where it was a year ago more or less.  and has vol>40btc/day.   that's my criteria.