You have built a rather unusual feature into your AOD program - it actually has some benefits to the consumer! Make certain your written description of your AOD program reflects these features. I've never seen a bank do this before so I'm wondering if you will hear from a banker with firsthand information.
While FDIC field examiners are prone to apply the label "unfair and deceptive" to virtually anything that doesn't crawl away at right angles, the phrase actually has a legal meaning. Your practice does not fit that definition. You simply have one class of customers choosing to receive these pricing breaks and another class of customers that chose not to. Regardless, your examiner may choose to see it differently.
Without commenting on any specific field office, it's accurate to say I've seen the FDIC threaten UDAP when I don't think they thought there really was a UDAP issue; they use it as a bullying tactic, but it does not make the written report. That works in most banks. Be certain of your convictions.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.