No, it's not the springs. Take a look at the Trokkar hooks on tacklewarehouse or the Trokkar web site and also at the new Gamakatsu flipping hook. It's a big black plastic collar with a barb that's on the hook and keeps the baits from sliding on the hook shank.
Toothpick is OK if you are not using floro and tungsten. It can pinch your line against the collar of your weight which because tungsten is so hard and floro easy to cut will cause too many break offs. Get you some rubber pegs at any tackle shop or bobber stoppers.
Too bad Tru Tungsten went under their peg was the best ever made.
Re: the Senko I use a 4/0 for the 4" and a 5/0 for the 5" and a 6/0 for the big ones. Wacky is great but I'm talking about fishing in thick stuff like laydowns, brush piles, etc places you can get hung up. That senko comes through that stuff like a charm.
The Trokkar web site is http://www.lazertrokar.com/
Go to "anatomy of a trokkar" and click "flippin hooks" and you'll see it. Gammy's is the same type and almost as good and is 1/2 the cost. 4/0 is the one for beaver type of baits for certain unless you use smallie beaver at which time I put those on shakey heads.