Tryno, I think your on the right path, I wouldn't worry about over watering making them too leggy. Over watering will give them disease and make them yellow and drop foliage or dampen them off though. But you don't want to cut too far back on water to the point that they dry up either.
I think a lot of people will tell you that the lack of light and too high of a temperature in the environment (such as 70 and above) will make them want to grow leggy. Basically, the plants will get leggy trying to find more light and having a warmer temperature inspires growth but not foliage growth.
Looking at your photo, I don't know that I would worry about those dwarfs getting leggy that much but those seedlings you just started will get leggy if you keep a light on them like you have it. You need grow lights 2-4 inches above the seedlings (if they're micros then it might not hurt them or make them that leggy though) to keep them from becoming leggy.
Al
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