#32 and #33 are interresting ideas. May be a different typography would enfore the logo. Why is in #33 the "d" blue but the diga yellow? Do you have a specific meaning behind it?
#79 the stylised approach of showing the "d" and "p" is interesting; do you have some more ideas to show it in a more kind of picture mark (fuller letters or forms but still stylising the p and d)
#159 Maybe it is still possible for you to prepare something like #159 in a kind of square form with slightly rounded edges, but not the round form like now and the round letters. But still the letters should be in negative white while the background should be coloured.