I jimmied the pattern to get a more defined shape, and smaller version: Work rnds 1 - 3 the same way. Sc evenly around making 4 spikes in the 4th instead of 5th rnd. Just get rid of row 4, with the clusters.
You should look like a goldfish cracker when it's half done. I did not intend this.
But it looks good when done:
As I always say, my patterns are just guides, and I was quick with this one, so EYOR!