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[ATM] Faucault testing questions

Hello All,
    Sixtests on my glass 10" f6, came up with a slight hyperboloid of
b=-1.05 after three , four zone data inputs- eight  zones when you
interleave main and intermediate masks. Strehl, P-V were great so I quite
figuring. Unfortunately, star testing requires more magnification then I
currently can do, so I decided to do more lengthy testing. This time I  did
nine readings the average of  which I plugged into sixtests, A Reijke, and
figure xp. They concurred that b was now overcorrected at  b=-.8   (have
trouble saving and loading frontsix)
    So my question :  In view of the recent controversy over Faucault
testing. Is it necessary to input a minimum quantity of data to get
accuracy? If not do I overshoot and go for a -1.25 hyperboloid?

Take care,
KR


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