There is a small bit of adjustment in the mounting of the WOT microswitches themselves.
See this small, oval shaped securing plate:
http://store.delorean.com/p-6651-securing-plate.aspx
There are two small screws that go down through two small holes in the microswitch and secure it to the "
bobbin" or better seen on the entire
throttle spool assembly. Those two screws thread into this securing plate and hold the microswitch(es) in place.
The aspect that gives you a small bit of adjustment, is that the holes in the bobbin/bracket portion are not round. One (or maybe both, I can't remember) are more oval, and the purpose is so you can slide that securing plate with the microswitch on it around a little to get it where you want it.
So, in your case, loosen a little bit both of those screws, but don't remove them entirely (or do remove them entirely if you want to see better what you're working with underneath). Then pivot the microswitch around enough so that when you rotate the throttle spool (with your hand while the engine is off), it presses on the microswitch just right. Tighten those little screws back up, but a word of warning, don't tighten them too crazy hard as those microswitches tend to get seized up from that added screw pressure and the little spring loaded stem won't pop back out when it is supposed to if that happens.