When I started I edited the file to raise Z to a comfortable level before moving to the first cutting position. Then I realized all I had to do is manually jog Z up and that's much quicker than editing the file. Now it moves from wherever I jog it - 1/2", 3", whatever - and stays that way until it reaches the starting point for cutting.
You could probably modify your Post Processor to add that line of code but it only takes a second to jog Z manually.
David