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Hi Fritter,
You asked Jeff or I to chime in - however I think you already have good advise.
If you watch our guitar video you might notice that we never used a ball endmill, it was pretty much a one-tool-wonder .25" Flat Endmill. We got away with that because the surface of the guitar was purely convex so the edge of the cutting tool could be used (with a stepover of 0.05") to impart a smooth curve.
Using a flat end mill - I've found you do indeed have to use finer stepovers - the exact value depends a bit on the material and geometry.
For the neck, I think you are best served (as previously metioned) by using both a flat and a rounded tool in two distinct sets of operations.
You can probably see in our Ukulele neck below that we have the round nose tool extending well below the body to get the well-defined contour edge.
Stepovers, you might use the simulation preview to get a sense for when things hit diminishing returns. I used 0.0125" here - obviously its a balance between machining time and finshed part resolution (and sanding).
Good luck - let us know how you get on!
-Nathan
Fusion