Edit: maybe I wasn't clear in my post.  I am not looking for different ways to model this.  I am just having a problem with the VBA correctly rotating the hob past 180 degrees.  Other than that it works perfectly.

I write a simple macro to use a custom hob cutter to create a worm gear.  As far as I'm aware, this is the only way to create such a model (especially in Solidworks).  The plan was to use a cavity feature between the two parts, rotate both the appropriate amount, and run that in a loop.  The problem is that at some point (at around step 12 how I have it set up right now) the gear seems to move quite a bit more than it should, completely ruining the model.  Here is how it should look, and here is how it looks after enough iterations.  I can't figure out if this is a mate issue, or a macro issue.  Any ideas?

Assembly and script attached: https://drive.google.com/open?id=1UfCddX2GJ21VDfuyXJ3EfYeOrO_nEuBU