Scott...
The springs are easy to check. They've been inspected and your shop says that they are not broken. Springs can loose a little of their tension over time but that wouldn't cause "hop".
The shocks are more likely the problem. They are well worn after 70,000 miles and your little "off road" episode may have added the last straw (but not been the cause).
Try this little test, open your hatch and push the rear of your Cruiser down sharply with as much of your weight as possible and release quickly. Your Cruiser should bounce no more than once up past center and settle. If you detect any more movement than that, it's a sign of worn shocks. Keep your eye on the open hatch because it's hanging out and will amplify any motion for you to see.
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