As has been mentioned, you dont always need to rest after the first or second pull. It is certainly a good idea to check if the party needs to, but if they dont, then its far better to just keep pulling in the mobs for the exp.
I was in a party last night that was a lot like that. War/Nin, Mnk/War, Nin/War, Whm/Blm, Brd/Whm, Smn/Whm.
After the first pull, I held back for about 30 seconds for the next pull, and ended up having the Nin ask me to go ahead and pull (even though the Whms MP was at about 80% or so).
By the end of that party (only an hour long) we had gained around 7800 exp (8800 for me cause of the hot new Empress Bands ^^).
We hit chain 6 from time to time, chain 5 always, and if there wasnt such a short timer on chain 6, I think we could have gotten like chain 15 just because of our speed. We would go through 15-20 mobs before we would rest to full.
Just like Stunted said, pulling is an art, and some people do suck bad at it. But just like art, there are many different forms and techniques used in it.