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Capital One's temporary reductions (I recently got one too) honestly strike me as almost more lame than not giving anything. If you're going to give someone a "promo", at least make the APR significantly lower, like 10% or 5% or even 0%. Giving a temporary reduction of a few percent is basically meaningless.
Congrats! Something is better than nothing
I just tried to get my 24.9% quicksilver reduced, and nada zip zilch nothing.
yet my 3 month old delta gold got a 3% reduction easily. It all varies.
Keep trying with the amex. I was just elated to see folks on here with 6-9% APR on an amex.