Like many of you who dived nose deep into X-Wing have come to realise, you'll find that our ships slide about on the gaming mat quite easily. This makes for a disruptive game as the game is meant to be quite precise.
My friend Roy found a simple solution. 3M Bumpon stickers. Once stuck under the base of the ships, they provide a solid grip. You can now push your template against the base and the base still would remain locked to the spot. Here's one example
|4 to a base. This ship now grips really hard on the mat.