makes a knit stitch followed by a yarn over and then the ssp, and a knit following that.
Perhaps what you are doing is the wrong kind of YO. You need the kind that follows a knit stitch and has a purl stitch next. So you knit the stitch, bring the yarn to the front between the needles then over the top of the right hand needle and clear back around until the yarn is in front again. Then slip your 2 stitches 1 at a time, kw to the RH needle, slip them back to the left needle and purl the 2tog tbl, k1. Try that? Did it work?