I have an question about your experience with or against PD-Decks because your advices say to kick white without a good reason is just kinda weird. I'm not waiting for the opponent to do something and it would be a really bad idea with 4 counters. I'm gonna for Deck-control by abusing SDT for DC and CB. CB with SDT on the board is mostly a win. My plan isn't to set up a clock it's to dominate my opponent.
Voidmage is nice, but i cannot support him

is just to much. (Play and be able to use his ability). Even in Mono U. Additional to that he is useless as a fast drop, because i won't be able to use his ability in the same turn and he slows me down by at least one turn, because i have keep uu for his ability. So i would play CB> DC > Voidmage i had to choose which should come first. (in common situation)
Same goes for Duress / Thoughtseize, this cards are powerfull. An solide opening without SDT on the hand, but not so good as a 2nd turn choice. So the priority goes down turn by turn. (common situation again, this card is more or less powerfull against specific deck types)