I think what people miss sometimes - I still do that - is that the other plane does nit have to catch you. 1K or even 2K difference means nothing. If the bad guy waits a few seconds before he follows you up he will be able to close the distance between you. He wont catch you, but as you are hanging at the top nice and slow he will come within 1K or 800. Them 50 cals will hit you from that distance as you sit there motionless. Now, if you misjudged the distance between you two or the e states, he will be mach closer.
In either case, never climb straight up. Either extend and climb or spiral.