Interesting Play on choice of using backround , foreground and colors. As far as lettering is concerned want to keep it linear and neat so line up the letters but feel free to play around with the legth and height of the letters as well as different bold fonts.
Also keep working on varations of the way you placed various abstract cutouts with in XES
Entry #18 Yeah i tried doing the s backwards as well and that didnt seem to work for me in regards to this design similar to what you did with the x try some variations of cutouts and or overlapping of the fonts.
Also let me see if you are able to come up with any other additional bold fonts and or may have to custom hand make the lettering.
Entry #44 and #45 Good work on the effort but these logos are a little bit too raw and rough for me. looking for smooth and bold type fonts. try again and experiement.