Bullhead rig: Dropshot vs slip sinker

[onwind]

Hi, guys,

I tried bullhead fishing for several times, the rigs I used are mainly two kinds:
1. a rig similar to drop shot(a sinker below two hooks 12 inches away), but I will throw the line out and put down my rod tip to let the baits stay near the bottom.
2. slip sinker rig.
I use the same bait(a piece of a night crawler), and throw the baits to the same spot. but what I found is that the bullheads always hit the first rig, when I changed to the second rig. the bites will soon become very few. but what's the first rig annoyed me most is that every time the fish will tangle my line into a mess.

So my questions are
1. Is there a way to reduce the line tangling of the first rig?
2. Why the 1st rig is more attractive than the second rig? is it because the baits are a little above the bottom which makes fishes easier to find them?
3. Is there a way to attract more fishes biting on my second rig? for example add a tiny bobber before the hook (a Santee rig).