I've heard of people removing some leaves like Al says.
That being said, My Vintage Motorcars Spyder has a full complement of leaves but it's a 2" narrowed beam. Shorter leaves makes the spring rate
I know the Formula Vee guys remove ALL the leaves in one tube and install an anti-sway bar in the tube. But a Vee weighs what, 800-900 pounds total?
A stock Bug is 1800-1850(as was a 356) and some Speedsters are 1700 pounds or more. There are a couple Speedsters that are lighter. My Spyder weighs 1500 pounds total with 45%(675 pounds) on the front. A stock Bug has 630-700 pounds on the front so I'm thinking the spring rate should stay the same if the weight is the same.