Skagit line for Beulah 7/8 10.5' switch rod.

I've posted this on another forum so forgive me if you have already seen it. Can anybody give me some recommendations on length and weight for heavy tip and large heavy fly work? I've gotten alot of conflicting information... Head lengths from 23-28 feet and weights from 380 up to 500 grains. I realize this is very subjective but I would appreciate a starting point. What are your real world experiences. Thanks