Steven,
A very good point that most fly tyers miss.
I WANT my hook points upwards whenever possible on all my subsurface flies.
I tie my Damsels on TDE hooks with bead chain on 'top' of the shank so the fly will flip and ride hook up. I tie the wing case on the bottom of the shank (I don't use a shell back on the thorax) and thus 'on top' as the fly is fished.
I think many fly tyers overestimate the effect the 'bend' of the hook will have on how a fly will ride in the water. It takes only a very little weight to cause the fly to 'flip'.
The use of weight wrapped on the shank on any TDE hook will usually cause it to flip, and bead chain or dumbbells on the top of the hook shank certainly will.
Buddy