A lot of "new" water in a lake does make a difference, I think you probably need to fish a little deeper than you might otherwise, of course visibility is usually affected also. The weather system that come with the rain seem to have more of an effect than the additional water. That bluebird cloudless day following a low pressure system is great for enjoying nature, but I can't get the guy at the fish market to sell me a fish that day, must less catch one. Most of the bass fishermen I know like a falling barometer and the day before bad weather is expected. Afterward, deep, slow and close to structure seem to be the key. Of course, that's just what I have been taught and do not apply well.