Exactly my experience from yesterday . I was using a low power of 96× with my dob .. it was quite a bit windy so my tube would vibrate few seconds and Sirius becomes a blur . The focus was highly critical - it was the difference between a star Sirius and planet Sirius. I first split Rigel with same 96× so I went ahead for Sirius . LOL my imagination made my eye see Sirius B all over the circumference of Sirius A . But Rigel B was surely there at 96× . Sirius B was a bit of rebel but will try higher mag when conditions allow .
@Kon As you are using a dob without tracking , allow Sirius to move in the field . Sirius B will be on the side of movement of the star .