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Looks beautiful! Love how you incorporated roman numerals in the name.
I would try a few different color variations, but keep the same blue and gray.
Try having the 6IX 6IX in gray and the 8 in blue. At first glance I read it as 69698, then I saw the tag.
Or you can try making the 6's the same height as the "IX" and keep the 8 taller.
... is there any significance in the numbers 668?

Oh sting! Zeros....
As a graphic designer, I'm a little unique that I'm good with numbers, so it's a good representation of me. There's a long story there, but I'll leave it at that.
Legibility was always an issue with this design, so it was important for me to add the Actual incorporated title of the company which is SixSix8 Productions. Without that, the logo is definately hard to read!