So you do the SK2P and then knit it together with the next stitch, P2, and then slip 1, k3tog, psso. And this doesn't look so good? I'd give it another try or maybe a try on a practice swatch.Iit's a quick decrease of 6sts but I'm not sure how it's being used in your pattern. Possibly you could decrease on the previous row and then again on this row for a more gradual decrease but it depends on the pattern.
Can you post a pattern link or give us the pattern name?