It is true a jig is the best big fish lure on the market. And I fish a jig about 90% of the time. However, there have been days when I would catch a fish in the bottom lip and on those days I would loose about 50% of my bites. My quess is that the fish was picking the bait up with it laying on the bottom.
With the two hook jig, I found that it does not work very well in grass, and most of the time I catch the fish on just one hook, but when it is laying on the bottom, one hook is always up. As far as coming through heavy cover, I have found this if I use my girlfriends curling iron, I can spread the weed guards a little more, and fish it in real heavy cover, logs, woods, bushes, whatever. And by using a no stretch line (flourocarbon-braid) hook penetration is not an issue. I have no trouble in hooking the fish and once he is hooked, he is mine.