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Also roll other wheel onto piece of 2x4 both wheels are level with scale.
It's not springs, it's damping that affects ride-quality aspects you're talking about. Turn down high/low-speed compression damping.
Also, your lowered bike is probably bottoming out on bumps. Sag should be about 1" not 4"! When there's no more suspension-travel, full force of impacts comes through. Remedy for this is actually stiffer springs to work with less travel. Increase preload and raise rear-end back up and you'll find it's much more comfortable!
Most likely pivot-bearings in your swingarm and linkage are dry and need greasing. I do complete teardown of suspension and grease everything every winter. Makes HUGE difference in ride-quality. Quick test on your bike would be to remove rear-wheel and disconnect lower shock. Test moving swingarm up and down by hand. If not glass smooth, definitely needs cleaning and greasing.
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