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The way I see it it's just a HP so take the chance and see how much they're willing to throw at you. If a new app would prove more fruitful the CFU is not a bad way to complete the trifecta since points earned with that card are worth 2.25 cpp when redeemed with the CSR through the travel portal
How long have you had each card? If around 6 months, and you don't mind a hard pull.... go for it.