Well if you can recover quickly enough to do 2 chest routines a week, then why aren't you already doing this?
If you want some advice a little bit of information would be helpful.
Firstly: Do you have broad shoulders and long arms?
Secondly: Do you have well developed triceps?
People with broader shoulders and longer arms tend to have weaker chests. Also if you have well developed triceps then these often take much of the load when you are doing chest, so pre-exhausting triceps at the beginning of your workout will allow your chest to do more work.
I also recommend some compound movements such as dumbell flyes followed immediately by bench press (incline, flat, or decline).