I don't have an X any longer, so this is more of a design-based answer: all CVs allow some plunge, and 1000 / X axles have CVs at both ends. You often have to completely unload the wheel in order to move the axle in/out.
Hey after reading quite a few Elka posts these were factory machine elcas that I found new unused at a Minnesota shock shop. I talked with a factory engineer and he told me which springs came at the factory but I don't think they're the best choice what did you use. The front's combined spring rate is 160 and only 200 when it hits the crossover.
I had the OEM setup. We did probably 50% trails, 15% rock crawling, 25% desert and 10% sand. The OEM springs fit our usage pretty good, though we did bottom-out often riding with the forum group at Glamis.