When I make the window full-width, your sig appears on three lines. However, the two different columns give the effect of more text. It feels cluttered, like you are, at the very least, pushing the limits.
Let me show you what it looks like in my standard browser window. I think you will see what is wrong...
You may be within the limits, or close. And there are certainly worse sigs on this board. However, since you asked whether we think your sig is OK, I answered your question. "No." You asked.