The spacing in #155 looks good. I still like the amount of green from #154 though, so let's go back to that.
Other than that, I think the "F" should be more prominent (it seems to small). The "F" in
#143 looks the best to me. Could you also increase the height of "Flick IT" so that it is the same size as the USB connector head.
#156 looks good, just remove the fading in "Flick IT" so that it is solid black.
Could you try changing Solutions to a black or charcoal. Or try changing the outline of the USB to something darker. Just having black in Flick IT seems too separated from the rest of the logo.
Let me know if you need some clarification on any of this,
Thanks again!