It just occurred to me that in the decrease section, all odd-numbered rows start with a knit stitch and all even-numbered rows start with a purl stitch. So maybe in the increase section, all odd-numbered rows should begin with a knitwise slip stitch and all even-numbered rows should begin with a purlwise slip stitch.
After reading this
, I don't think it matters as long as you're consistent.
The difference is probably subtle anyway. I'm just going to start my clapotis!
Also ETA: Horse Power, I love the yarn you've chosen! That's going to be perfect for spring/summer.