sk, you're chest is definately the weak link if your incline and flat bench are equal. Your observation of your delts overpowering your chest is a result of the imbalance. We can probably rule out tri's being a weakness because if they were, they would have less help from your chest on the incline, so you should see a slightly weaker incline. Try doing more flat flyes. Pause at the stretch on the bottom. Also, you may wish do do some dumbell flat presses, and really focus on contracting your pecs hard at the top.