#1 and #2 Reduce the size of the D. Make that D and Z separation really pop. #3 Try some other line variations under the DZ. #4 #13 #14 all have the same issue of the DZ fading away too easily. It really needs to pop more.
I like #187. Let's take #190 and try putting it all on 1 line where DZ is smaller and matches the size of Solutions. Give Solutions a bold lettering, but that doesn't take too much focus away from DZ.