Have you tired to dips lately? Dips really hit your chest muscles hard and it seems to stretch the muscle. If they seem too easy try doing weighted dips. There are a couple ways you can do weighted dips. The easiest way is to buy a dip belt and hang the width from the belt. You can also put a dumbbell in between your ankles while doing the dips. This will limit the amount you can add however.
When should you start adding weight to dips?
I would say once you are able to do 15-20 reps easily, then you should start adding weight.
How much weight should you add?
I like to start with 25 and workup to 45 then 90. Try to work you way up with the weights as your able to do more reps. Stick to about 8-10 reps.
So try doing some weighted dips today. You will be amazed how your chest feels after a few sets of them!!