Is it in bloom now, or are these photos from in May?

How big are the trusses? They appear to be quite small.

How big is the plant?

My first guess is
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Scintillation

It blooms in mid season. It opens a bright pink with a yellow blotch. After 3 weeks, the flower is still open but the pink has faded to a pale pink and the yellow blotch is almost gone. The individual flowers are 2.5" across and the trusses are about 6 to 7" across.

Here are other possibilities:

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Janet Blair

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Wheatley

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Virginia Richards

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Westbury