Agree with Rocky and RL, don't even think about it. Our auto department had similar discretion a few years back... and let's just say it would be in your best interest TO REMOVE ANY AND ALL AUTHORITY TO CHANGE PRICING.
Also, why do you not base pricing off of credit? 8.00% seems really high for a base rate (at least in our area). If your not pricing based on credit, you're probably already not pricing competitively. Why would you give someone with a 800 CB Score the same rate as someone with a 660?
As RL said, for example, you have a bunch of savvy, educated borrowers come in and discuss competitor pricing and you drop their rates by 2.00%. Then say by chance, all of these borrowers with discounted rates are white middle-aged males.... guess how that story ends.
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The opinions expressed are mine, do not represent the opinions of my employer, and they are not to be taken as legal advice.