Two weeks ago I cancelled my CF on the (now known to be erroneous) speculation that getting a CFF would not be possible if one had a CF. That cancellation seemed rash at the time, but I always had a backup plan in mind. Today, I executed it. Instead of applying for a CFF I applied for a CF (instant approval). After all, the CF gets the same SUB as the CFF (and that's all I'm after anyway). Of course I used a referral from my wife.
This is an interesting DP in that you were able to be approved for a Chase card less than 30 days after canceling the same card.