Brake Master Cylinder Lid Leaking

Have a 2-year-old Leed Brakes LEB-A8471 master cylinder that started leaking from under the metal lid. The gasket looks good and the lid does not look deformed. Led sent me a new rubber gasket but it still leaks. The brake fluid in the larger bowl is 3/8” below the rim which Leed says is correct. The fluid gets up over the top of the gasket (see no holes) and drips down the sides. I thought about making a thin plastic shim to put under the metal cover to exert more pressure on the gasket. Any other ideas? Is the fluid too high?

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