Not a big fan of the octagon shape..... can you try to make something similar to the photo I've attached... sample 2. It requires some creativity to make the S P U R into one symbol, but I think you can do it. I like the font you're using otherwise
Overall the best, but can you try some more variations making the symbol?? I'm finding it a bit too bold (thickness).... Try rounding off some of the edges, so the S doesn't look like a Z.