I read here that sometimes the Sonys will under-exp. so I over-exp. by 2 stops (using a light meter).
As always, some sample shots would help us identify the problem. The A200 does have a tendency to underexpose, but never more than 0.7 stop. So over exposing by 2 stops is ... extreme as you'll suffer from blown highlights and a general reduction in contrast.
Don't take this the wrong way, but I think you're doing something wrong. If you could show us some samples, preferably a comparison between photos taken at automatic and manual exposure.