While the Laffer curve represents reality, it is not the correct measure to determine tax policy.
Think of a new plot, the CurlyDave curve, where we plot GDP vs. tax rate. We want to adjust tax rates to maximize GDP, not to maximize government revenues.
>> We want to adjust tax rates to maximize GDP, not to maximize government revenues.<<
You are right, but the point of supply side is to maximize personal production - the increased tax revenues are just a way to sell it and a way to point out the hypocrisy of the redistributionists. So, supply side is great theory, and balanced with a target % of GDP for all tax expenditures is fabulous.