Armholes uneven?

[wilddog]

I am knitting a tank top on circular needles, but I am working on the flat not in the round (ie, back and front are 2 separate pieces).

I am ready to shape the armholes for the back and the instructions say:
(RS) BO 6 sts at beg of next 2 rows, 2sts at beg of next 4 rows, then dec1 st each side EOR 6 times

If I BO 6 at beg of next 2 rows, my second armhole will begin on row 2. Won't that make the armholes look uneven from one side to the other? I really want this to come out nice.

If someone can explain this to me I would appreciate it.

Thanks.

Linda