Would this help with weight transfer?

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OK, until I can come up with enough money to really build a chassis and put stuff on it to really make my truck handle, I'm trying what I can afford for right now.

My truck is lowered 4.5/5.75 with 2.5" drop spindles and 2" front drop springs and 5" rear drop springs and 3/4" blocks. The truck has good stance, but with a rake so the rear sits higher. As of now, I have very little traction. I really can't give it the beans without the rear tires just giving up.

So my question is this: Is the rake hurting weight transfer? If so, would swapping to a 6" rear spring help any? Also, do I need to look at spring rates? The only company that advertises(or even knows) spring rates is Hotchkis. Theirs are rated at 380 lbs/in. ECE just says their springs are rated at factory specs to keep ride quality the same. What are factory spec rates for rear coil springs?

Also, what else can I do to improve traction without compromising cornering ability?