I plugged all your data into KBB, and even working on the assumption that the condition is excellent (meaning no visible wear, micro-scratches, and that it's perfect in every possible way) I came up with a value of $15.8K, not $16.8. I think you're pricing yourself out of the market on this one. If you want it to move, you have to expect that people are going to go through the same exercise and conclude that your firm price of $1K over the KBB value isn't worth their time.
I'd drop the price by $3K.