I'm with Mark. Without the watt's link, the leaf springs were determining the roll center. Now, with a Watts, you are in control of where the RC is. Did you match the watts pivot location to the leaf's RC location? If not, you have two competing RCs that will usually cause some goofy handling issues.
But it sounds like you got it figured out anyway.
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Matt Jones
Mechanical Engineer
Art Morrison Enterprises
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