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The flat lifters should work as design. The camshaft lobes has a front to rear ramp on them to make the lifters spin.
Placing a crown on them would reduce the spinning effects.
On a side note, roller lifters camshafts does not have a ramp on the lobes. You do not want those lifters to rotate.
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Yes, the camshaft lobes are ground on a slight taper, but the lifters should have a crown. Should they be flat, that would result in a line contact, which would wear rapidly. The crown helps break in and mating to the cam lobe. It does reduce spinning to an extent but helps distribute the load better due to increased surface area.
Take a look, this article explains it very well:
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