I have been using a well defined trading range to gauge my lock/float recommendations. The idea is to lock at the price highs and float at the price lows. On Friday I recommended floating through the weekend, this strategy worked out well as mortgage rates are modestly improved (not big improvements) today. Considering that MBS are holding near the top side of the trading range and as AQ and MG put it, there isn't much room for MBS prices to continue to improve, I have advised a few of my higher loan amount clients to lock in their loans....