[mike657894]

you may have a wheel problem, bent, balance, tread seperation ,side wall buble. softer springs would be more bouncy until you get the violent rack of bottoming out. less pressure more bounce higher pressure harsher over bumps. Over stiff shocks would feel like your springs are froze stiff and make bumps feel very harsh. Rusty springs would limit how far your spring can travel. my local roads have some resonance in the way they are made. if I accelerate at just the right speed it will set the car to bouncing. try different roads. If you can have a someone follow you and try to look at your tires while you drive or have a passenger in their car video it. If your springs are dry they are probably frozen and like any spring they may have 10 15 or 20 years of life in them from when they are installed. easy to out age springs in a old car. The more frozen a spring the more bongy it will be on its ends. The cheap skate way is to remove springs grind off the rust and grease and reinstall and rotate them against the lean of your car. More trouble than its worth and your left with free moving weak springs.