Your pattern is k4 then (p1, k4) to the end and, p1, k4 on the RS. So when you increase sts, you need to keep the p1, k4 sts. On the first RS row after the first inc, you'd p1, k4 to the end, and p1 in the last stitch. After the next inc, you'd do the RS rows a k1, p1, k4 and end with k4, p1, k1. Then you would just keep working another knit st at the ends until you have 4, then p1 until the next inc, and start working knits.