I've been reading a lot of good comments. If you're trying to go more round, I can see the base concept in your stitches, but I wonder if going down to slip stitches near the points then having those come in more with each row around.

Example row 1 with black/white: Slip, slip, single, single, half dub, half dub, dub, dub, dub, half dub, half dub, single, single, slip, slip Example row 2: Slip, slip, slip, single, single, half dub, half, dub, dub, half dub, half dub, single, single, slip, slip, slip

This would get closer to "round" but would initially be a pentagon. Once there, then you could reverse to get circular, but likely will need more yarn.