Let me begin by saying this is not about an injury. There is no pain during or after my workout (apart from the normal feeling of a muscle straining to lift heavy weights). It's simply that my inner thigh seems to be working a lot harder than it used to 20lbs ago.
The feeling runs along my inner thigh as if it could be my sartorius or adductors, but I don't see how either of those are related enough to the squat to be staining during the lift. This makes me wonder if maybe my form is somehow incorrect and as a result an inordinate proportion of the load is being offloaded onto those muscle when it should be on the more major muscles (VM, VL, glutes, etc.). Is there any common form mistake that would result in a load transfer from the prime movers to the sartorius or hip adductors? Or is it that the sartorius or hip adductors are more vital to the squat than I suspected; meaning it is to be expected that they feel strained under a heavy load?
For what it's worth, I'm aiming for a wide stance, low-bar squat. And when I say wide stance I mean like an inch or two more than shoulder width and with feet pointed out 30°.