Thanks so much for the welcome and for posting back.
I might have misunderstood what I'm supposed to do with sl. There was no indication in the pattern to do slp for the purl stitches in the ribbing - only sl. Basically I slipped every stitch (either knit or purl) by sliding from the left of the stitch to the right, but leaving the yarn where it falls naturally and not moving it forward, then back again to purl. Does this make sense?
If I understood your post, I should be doing an slp for the purl stitches. I'm into the pattern about 6 repeating rows after row 5 - I'm thinking I should probably start over again.
I appreciate the help and not too worried about starting over if I must.