Personally, I wouldn't recommend going to White March at lv7 unless you like steam rolling content...
I just reached Dyrwood at lv8 and when expansion was released I entered the White March all excited. Sure, WM zones were fun and challenging, with good items and good pacing. Devil of Caroc is an awesome companion with great voice acting. HOWEVER, by the time I was done with TWM I was around lv11, and when I went back to Dyrwood on the vanilla campaign everything became so faceroll. Before you ask, this is on PotD difficulty.
As someone who plays for challenging encounters, I just lost all interest and will to continue playing. Now I'm contemplating if I want to restart and leave TWM content for lv12 where I can scale everything up after I am done with vanilla campaign. But my dilemma is that I also badly want Devil of Caroc in my party as soon as possible, and there is no way of doing that without "locking" TWM zones to lv7 the moment I enter it
If anyone has any solution to this, please kindly advise.