If you have 1 collet that always works (runs true) and others that wont, I am lead to believe that the collets themselves are just crap.
Can you buy precision ground collets of the same style (you didn't mention what style they are).
The only spindle mount I can think of like that (3/4 UNF) is a drill chuck.
You may have to make a custom spindle nose to use other than the OEM tooling.
Another option would be to have all of your crap collets reground true to 1 size up.
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