Slight taper turning between centers

Sorry, not good enough for what? Do you mean if I make my own test bar?
 
Forgot to follow up last week, but following up now for posterity. Thanks to Mike for talking me through an answer.

The problem turned out to be the diameter. My bar was 12" long and 3/4" diameter turning down to 1/2", so after adding a steady rest in the middle, the taper effectively disappeared.
 
sure sounds like bed twist . a rough test is to clamp a 4 ft. straight edge to the bed close to the headstock and another to the tail of the bed . a good carpenters level at the ends will show any twist magnified greatly.when the level shows the same when turned end for end you can know there is no twist.
 
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