repetoire fine-tuning

i need to get some lines v. the slav proper (1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4) and the Queen's Gambit Accepted (1.d4 d5 2.c4 dxc4). They are things that are rare enough in blitz (and i'm probably making the same mistakes over and over) but i would get over the board