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I personally think the X code springs are the best route, although that being said, I have 2.7" mini leafs, and I run 315/75/r16's roughly 34.7" tall, and I did have not had any issues with the spring packs. The drop shackles are an effective cheaper option as well.
One thing with the mini leafs, is that you keep the same shock travel as the lower mount is atop the spring pack already.