Unsure about all the details that Mays says; but little or no toe in rear will make the tail end dance around-especially if you go negative.
Also; I'm pretty sure you supposed to line up the rear before going to the front..& this may sound weird & the alignment shop may not do it....but road test it good & then throw back on the rack..as it seems things will settle.
I performed my own alignment & had to tweak it over a couple week span-to get the drive & measurements I was looking for.
A real learning process.
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