Bones the bigger the student enrollment the more kids available for football and other sports which implies that that class should be better than a lower student enrollment class. The unfairness IMO comes in when the success factor comes into play only for open enrollment schools which punishes a lower class team for being successful but successful programs around the state are not. IHSA in effect punishes success for some and stands idly by when other successful programs dominate their respective class year after year. Enough said!
You would think this is evident, but every year we get stuff like, "4A is better than 5A" or "7A is better than 8A" or when some top 6A school beats some one and done 8A school by a single score we hear how it reflects on the class. To me what you typed should go without saying, but sadly it doesnt.
As for the SF we had a discussion about it in the offseason. If you look at it like a modifier to the multiplier then it makes more sense. Some people have argued that the multiplier shouldn't be applied to every school as some don't experience extraordinary success. While some schools make a mockery of the multiplier. It's unfortunate, but no amount of tinkering with "solutions" is going to make all sides happy, nor both sides believe it is fair.
Although I don't know how I feel about the only solution to remedy this problem, I do acknowledge that a split is the lone way for both sides to see the post season as fair and equitable.