Lathe is cutting a taper

If the tailstock has poor adjusting feel, it can be easier to do with two wrenches or screwdrivers with them fighting each other so to speak. Glad to hear you got the bed twist taken out.
 
To adjust the tailstock on a SB Heavy 10 I mount a test indicator so it touches the side of the tailstock ram.
Loosen one screw, Tighten the opposite screw and watch the indicator move. Snug up the other screw once the indicator is in the correct location.
I do this with the bed clamp snug not super tight. It does not have to be loose.
 
I find that the cast iron might slowly move after leveling and cause an overshoot in adjustment.
Always recheck after a couple of days until it's settled.
 
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