Originally Posted by Fluffy Kittens

I wouldn't put more weight on one dumbbell, that would be dangerous. One thing you can do though is always start with your weaker side. Although with chest that's difficult as you're working both pecs at the same time.

I'm left handed and left footed but my right quad is bigger than my left and my left arm is bigger than my right.

EDIT - My right arm is stronger than my left too, both bicep and tricep. It's weird.