Installed bbk springs and still 5" wheel gap?

I just installed my rear springs today. They are bbk progressive lowering springs. I know that the springs settle a little over time and that it will probably look lower once it is on the ground, but there is about 5 inches of wheel gap still. It was really hard to swap the springs out because it seems that the control arms are binding and it wouldn't let the rear drop low enough. It also make a horrible creaking sound from all four control arms when the suspension is moved up or down. Are the bolts just too tight for the control arms or is it time for new ones? They were on the car when I bought it. They are Proform upper and lowers with urethane bushings, I think. I also have bbk polyurethane isolators top and bottom. I wanted the car to sit low to look good with 17 inch cobras but it is still the same ride height as stock springs. What is going on here? Will it lower a lot more once all four tires are on the ground?

Pic with stock springs (one coil cut in front)
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Pic with bbk springs (jack stands under the rear axle and front frame)
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