"Next row knit 2, slip 1, knit 1, pass slipped stitch over, pattern to last 4 stitches, knit 2 together, knit 2.
Next row purl."
It seems to me that these are the 2 rows that you should be repeating. I would put the decrease on row 1 (the knit row) or on row 3, (the k1, p1 row).
So purl rows 2 and 4 and do the decreases on 1 and 3.
I think you could do a k2tog or p2tog for the decreases on the k1, p1 row. See what you think looks best.