#43 - Interesting and classy. The 6 interlocking zeros look very nice in this pattern. I am not sure this one goes far enough to be the logo.
#44 - This is clever and a very good idea. However, in the current form I think you have to be told that the initials are there. It is not obvious unless you already know. Can we make this more distinct? Maybe bring in a 2nd color or shading or spacing to make it jump out. I saw it as zeros, but did not notice the initials before I read your explanation.