Cool, so how fast or slow would a NIKI need to be with me doing 240 (and slowing as I pull and drop flaps) in order to get guns on it? In theory of course. I don't know what the other guy was doing.
I find this is easiest to do if you convince the N1K to stay fast. Make him think you want to get away, so he's in "gotta keep up" mode. Then set him up for an overshoot. You'll be slower than him, and easily turn inside him. You'll be near your best turn rate, and he'll probably be above his...
Once you get behind him, kill him quick, or things will get nasty, and quick. Pressure him enough to get him to squirm, and let him make a mistake or two. As soon as you realize things are no longer going in your favor, you need to be ready to exit and reset. Don't wait until you're obviously losing; that'll be too late. As soon as you're no longer gaining, think "exit!" I like to do that at a point in the fight where I'm nose down, and he's nose up. That let's me get a bit of a head start to build speed. It probably won't matter at that point though, he'll still probably catch you; which is exactly what you want. Once again, you want him to think he needs to chase you down quickly before you get away. Pull your overshoot move, and try to shoot him again... Wash, rinse, repeat.
Here's a clip I posted in another thread-
http://www.4shared.com/file/173259319/6212f19a/DREDLOCK_190D9_BRD_and_RatCH_N.html