I was wondering why this wasn't suggested earlier. Definitely my first instinct.
Meh, you could probably split the lower body training into one day quad-dominant (squats and lunges) and one day hip-dominant (deadlifts and cleans). But if it's working for you so far, with improving strength and size, then it's obviously fine.
But once you include the heavier front squats, your body might recover better splitting legs into those two days.
Stick with the heavier, lower rep training, 4-6x4-6 should fit the bill.
You tell us. Keep the training consistent and you'll be on the right track.