The way I've viewed it is PER is jump shooting and 3's, or anything outside the paint. The real question is, at what point is LP rating taken over PER rating. I consider baseline shots or "just outside the paint" to still be LP shots but I'm still reviewing this assumption.
I think the 80/30 vs. 95/1 is not a fair comparison either. Its 110 points of rating versus 96, plus the real difference between LP rating is a mere 15 points, and 80 is already very high. I think a more proper comparison would be 95/1 vs.66/30 for the conclusion you are attempting to draw.
And in this case, the engine is going to make a decision if he's going to take a jump shot versus a shot in the paint. In the 95/1, its should be disproportionately shots in the paint, and he should almost never shoot jumpers. Therefore, you want the highest rating you can. In the case of the 65/30 guy, the engine is going to have a more even mix of per/lp shots, based on his ratings, and what you'll get is a player who's slightly above average in the LP and bad in the PER taking shots. All other things equal, I want the 95 LP guy. If you want shots taken away from the basket, then get a second scorer who shoots outside the paint.