It very well could be run block slider is just watered down, but there seems to be a fundamental problem in run blocking where the line doesn't try to turn their man enough or at all a lot of the time.
Take for example: Shotgun formation with 3 wide to the right, one to the left. HB is lined up strong side next to the qb. Play is a handoff sweep the weak side - left. D lines up dime and man to man, so the d is very open on the weak side. This is nearly the perfect situation for this play and it should have big play potential nearly every time it's run in this situation.
If the left tackle can just turn the defensive end and seal the outside, it should be lights out if the lone WR on that side can get any sort of decent block. The problem is the LT never seals the end. He just blocks straight forward when he should be using footwork to seal the end back to the inside.
I can even move my line to the inside to help the LT try to seal me and he doesn't. He always blocks straight up and allows the end to break off and get an attempt at the tackle.
Even when I slant the d line to go to the right (away from the play going outside to the left), the tackle actually tries to get into position to push me back to the outside. He'll stand up and try to run back to the inside and push the end to the outside. He should just give me a shove to the inside and then move on downfield and look for someone to hit or engage with outside leverage and pin the end.