I use mostly size 14 but sometimes a 12 is the ticket. I rarely use 16 or 10, but they do have their place. Note this info is only for mtn fishing. On tailwaters I rarely use a BH Prince unless I'm on the Clinch or Hiwassee where they can be good in large sizes at times.
I came up with my own Yellow Sally recipe. I don't know if it will work we'll see. Yellow thread, some yellow dubbing in sparse layers, and Yellow Elk Hair. I tie this in a small 16 since many Yellow Sally's I've seen on Little River are small.