Hi Ving,
good luck. It is very difficult, and I have yet to do it myself. If you seeing was poor, as Alnitak would suggest then Siruis will not happen. It needs a good (and large I understand) scope, with better than good seeing. Keep trying, but if Eta and Zeta Orionis can't be done, then I would guess Siruis won't either.
Beta Musca, and Gamma Centaurus are two other good'uns.
Gary
P.S. a while back I had a double machine, a 10" Maksutov Newton, and Sirius eluded me, as it has in a friends 16" newt.
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