Should I send back Polk T50s.

I recently was forced to replace my old Polk VS 25 speakers with Polk T50s. They don’t seem to be filling the bill and are dominated by the PSB Alpha C which is my center speaker. In addition, two Klipsch (HD 500, I think) for my rear surrounds. My receiver is a Denon AVR1913. Should I replace the Polk 70s and if so with what?

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