Hey, Bob, your set up is much like mine, however, I also have a stablizer that holds the forearm in place [ it's bolted to my main fixture, of to the side. it's a flat plate, with an aluminum tube, welded to it, It's tapered to fit the angle of the forearm,], and has only one side expossed to the 90 degree wheel, with this added stability, the points come much closer, and look very nice.
I also, use a larger tool than you or Lee, I have 2- 90 degree tools X 3/4" thich, one is 3" the other is, 4", by having a larger dia. it leaves a smoother finish, because the "tip speed" is much faster with the larger wheels. As far as the width between the Pockets, mine are around .060Thds, this is also depending on the lenght and depth of cut....
blud