I've had the same experience recently. I switched from extract to all grain, and mashed at lower temperatures to get a higher alc content. But some of my beers, especially the lighter ones just don't have any pizazz! Watery.
I've decided to up my mash temp a few degrees to give me more body. That's what I really like in beer.
BEER: The Cause and Solution to all Life's Problems
Aging: Ugly Monk Belgium Abbey
Drinking: Heavenly Honey Wheat,Chocolate Stout, London Porter, Big Fat Fatty's Oatmeal Stout, Pete's Porter, California Not So Common, Ugly Monk Belgium Abbey, Maple Brown
Upcoming Brew: Bass Clone, Fosters (a light drink for those who think beer has to be light).