Well, i am confused about jig hooks too! The arguments i have read suggest that the downward kink in the shank with weight on it, helps the hook fish bend/point up to help prevent snagging. This bemuses me, and i do not agree. Some of those statements are on this forum.
My experience with putting weight below the shank using bead eyes in my case, forces the fly to fish point down. If i put the bead chain eyes on top of the shank, as usually recommended, (Humungus etc.),the fly fishes point up.
Ok, if the fly is on a tight line, dropped into the water and actually jigged up and down, no problem, its actually being used as a jig. The kink and weight help to give a see-saw effect.
But for normal casting and presentation, i don't see the point. No pun intended!
P.S. John, those are great little killer nymphs! Nice ties!