If you have QGD Exchange variation in your Black repertoire, you have one of the most reliable variations to counter 1.d4. Would you consider something to spice things up? By the way, it might be an idea to think about adding QGD to your repertoire once you know, that you have an aggressive variation vs most challenging line. I am excited to offer a "Spicy Twist" with 7...Bg4-move. I believe Black is in a good standing in this variation, moreover, it can be a nice, surprising weapon. As always, my database offers a very detailed coverage which will serve you well for many years ahead. Suitable for 1600 and all the way up to titled players!