Damn you need a 4 link. No way is a 30 inch anything ever going to correct. Even if you valve the shocks so it takes two cranes to pull them apart, that short, high IC is killer.
I'd bet everything I have your car with your power would want an IC 2-4 inches off the ground (who knows...if you have 50% or more on the rear axle you may need a 0 or even a minus IC height) and at least 108 inches out. Again, could be longer depending on weight distribution.
At your level 48% on the rear axle is miles better than 50%.
