That makes these two styles of hooks, Straight-Eyed and TUE Guaranteed Horizontal with the Hook-Point-Down. Now, what about the TDE hook?
Again run the tippet through the back side of the hook-eye going down to the belly side. Again tie a slip knot on the end of the tippet. This time, run the nymph through the loop of the slip knot head first, I repeat head first. Position the loop between the hook-eye and the head of the nymph (on the fly's head thread). If you have this correctly positioned the tippet should be under the loop. Tighten the slip knot with the knot of the slip knot on the hook's belly. Pull the slack out of the tippet back through the hook-eye. This is Guaranteed Horizontal with the Hook-Point-Down for the TDE hook style.