So I'm looking to upgrade the rear suspension on the Omni. I'm looking for the right spring rates I would need in order to catch the weight and throw it back forward smoothly.

If the rear corners of the Omni were to weigh around 400lbs each, would it be appropriate to run around a 300lb/in spring? I would think that if you were to match the rear corner weight with a matching spring rate, that it would be too stiff for launching.