Yeah, it just takes a lot of practice. Just remember that to double-back and get haybales if the dragons aren't doing anything, and go right to left towards the haybales if you can. Those cranky buggers can really throw you for a loop if you're doing it without a strategy, but at least the reward's worth it...kinda.
Take me down from the ridge where the summer ends And watch the city spread out just like a jet's flame
i went from left to right, tapping the button as fast as possible until all the food was gone, refill repeat. doing it that way i won on the first try, and it wasn't even hard. beforehand i was being more strategic, feeding this or that dragon first, and failed miserabley. maybe its just easier on the emulator with my logitech controller, though.
I've always gone for it on regular NG, not too much trouble at all with a good strategy.
I usually aim for keeping the left two screaming/fed at the same time, and the right two screaming/fed at the same time, poking the middle when needed. If you keep your hay full the whole time(no waiting in the middle for one to yell if you can hold one more hay >_>), and wait in the middle when that's covered and all's quiet, and you end up with a pretty clear shot until around 60. After that they get a bit too fast to keep that up, so the already mentioned "just go back and forth tapping the button as fast as you can" method can usually guarantee you that early iron suit.
I did it with save states on an emulator.... It could be done normally. It would just take more time, of doing it over again each time you mess up (as opposed to starting at a save state). But you definitely just have to make him fly across the room mashing the X button, and you have to remember to fly to the left side of the room and mash the X button three times every time you press it three times anywhere else. You dont even really have to pay attention so where you're doing it. Just, three times, load up, three times, load up.
I did it with save states though, so... who gives a hell about my strategy :P