Yarbles, as long as you don't get into a sustained turn contest with them, the spit 16 holds all the cards: its faster, its tougher, it climbs better, it accelerates better, it dives better, has better guns, rolls better.
So your question is not so much 'how do i beat zeeks in a spit 16?', but more 'how do i beat an aircraft which has a superior sustained turn rate?' The answer (and the anwser in nearly all cases) is simply to use your aircrafts strengths against your opponents weaknesses.
How do you use your:
- speed? make them chase ya a bit. This will build you an energy margin to use against them.
- toughness? HO em, dive to insane speeds etc.
- climb and acceleration? force the fight into a series of constant slow down and accelerate/climb phases, which will maxmise your acceleration advantage and build an E margin for you to use against them.
- dive? make the bastige chase ya down into a mad dive. He'll either fall to peices trying, auger, or simply loose E cause they can't get the speed you can out of it or loose control and take too long to pull out.
- better guns? HO em.
- Roll rate - scissor fights.
Lots of options