Actually, optimal growth would occur with a constant load applied against the muscle with the perfect amount of nutrients. Frequency of loading along with progression is really key with training any muscle, so I can't agree with 2x a week being optimal.
It certainly is better than using all that shit you're using though, cnova. Stick with a few basic exercises for the chest. Try incline bench press coupled with dips or flat bench press. Drop the flies. Drop the pushups. Drop the pullovers. They're useless.
As for the shape, you can't change that. Your parents gave your muscles their shape. That's what we call genetics. Do what you can to build your chest thicker - it will fill out how it was intended. You can do little else.