What is the difference with BFB tune versus BFB Autotune, (BFB.U and BFB_Atune.U)?

Should I be using BFB tune?  If so, what is the difference with BFB tune versus BFB Autotune, (BFB.U and BFB_Atune.U)? I have a 5977B MSD.  I am currently using the Extraction Source Tune (Etune.U)  My spectra does not always match well with the NIST17 library.  I am doing a lot of volatiles work.

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