intraining....i like to mix it up between flat flyes and incline flyes. also, on the pec deck, if you have the type where you can put your arms way out use this one (there are some pec deck machines where you bend at the elbow, and rest your forearm against a pad.) i always use this machine, but occasionally i will do one are at a time, so that i can bring the arm further across my body, instead of having to just stop directly in front.
gjohnson5....yes, lats. and no, don't lay flat. keep your arch and dig your delts in, and pull the shoulder blades together! this will keep your back tight. (also dig your feet in, and learn to transfer the drive you can get from your legs, this has helped my max a lot.) i read some articles by louie simmons and dave tate (of WSB), and they talk about their benching, and that keeping the back tight, not flared, helps to increase the stretch reflex (reversing the weight.) as you are sitting there, try sitting up and arching the back as you would while lying doing a bench press. bring one arm back as if you were benching and were holding the bar in your hand. reach around with your other hand, and feel your lat. while feeling your lat, push the other hand forward with as much force as you can. you will no doubt feel the lat contract, this is where the majority of the reversal stregth comes from in doing the bench press. try this next time you bench (well, with both hands on the bar and lying down of course.)