Its a challenge to develop and continue a program where every position has some kind of accountability. Its hard to always identify reasonable and challenging responsibilities (expectations) for each position. And its especially challenging to how to apply reasonable accountability for each position. I think those are some of the most difficult challenges of the adult part of the program.
What I have observed is the positions that are held accountable are the ones most respected. And while there are a million ways to hold scouts accountable, the best accountability that is clearly measure by the expectation of the group. If the Grub Master didnt bring the food for the campout, that is a clear measure of performance. If the campout didnt go well because a scout decided not to plan it, that performance, or lack of, is a measureable by everyone.
Without knowing your troop, we cant say what you should do. I can guess however with some confidence that the SPL is not really respected as a position of serving for the good of the program. There is clearly something missing.
Barry