I have decided not to play the slav at all, I will return to the nimzo, but I will not play QID or Catalan anymore after Nf3 or g3, instead I will play Benoni.
I think these 3 openings form a very good unity (sicilian taimanov, nimzo/benoni, symmetrical),
so symmetrical is for me

.
The semislav is all in all maybe a bit too solid to me, and a bit too unbalanced (some lines dry, others ultrasharp), also I do not want to have to fear the exchange.
But I respect the opening, it is totally sound, but if white choses so a bit too dry, also in the semislav you have to know variations until move 30 in the botwinnik ... I do not think it is quite the right thing to play in open tournaments, especially against lower rated players, for super gm's playing many openings and their own kind it is probably better suited.
MnB: Of course, white is still better in the symmetrical, but I do not have additionally have to concentrate my forces to regain a pawn, time which my opponent will use to have a better piece coordination, and so he still has the iniative after I regained the pawn, and the longer the game goes on, the more pieces are exchanged and reaching the end it becomes harder and harder to get an advantage.
of course I can still win, but you should look for some games of gm's in this Qa4+ line, almost no wins for black in this line.