I thought that was only me who felt this way. They are a great fly and sounds like the foam back is a good way to simplify them but I always found the back/wing proportions to get correct.I don't consider the humpy an easy tie.
As for the flies pretty much second most of what has been said but for mountain streams in particular I try to incorporate foam as much as possible. It’s ok if a fly is a little bulkier since you’re usually fishing fast water anyway. I tie EHC and stimi’s with foam (orange, yellow or black body), sometimes do a red humpy knock off deal with foam too. Im a fan of royal wullfs too but wouldn’t classify them as ‘simple’.