OK, well I only cut slots for three guitars.
1st. one I tried Clime-cutting and Under-cutting.
The thing with Clime-cutting is that the saw would jump forward and jam occasionally.
Undercutting seem to illuminate the Jamming but sometimes the start of the slot ended up .005" wider.
On the 3rd. guitar I did a clime cut with a fast return cut to make sure the cut was at full depth.
Out of 25 cuts two had a .005" wider at the far side of the cut, not to bad, filler!