Hello Dazz,
That's kind of weird. It seems that the srews fit a little too loose in the srewholes. What you can try is new srews. Or turn out the srews and remove the pickups, then put a little, thin piece of rope in the srewholes, trie if you can turn in the srews and look if you have to use a little force. Then add, or remove, some of the rope and try again till you can turn them in with just a littele force. When that' done, remount the pickups.
Maarten