I was about to give you the same advice as Tom gave you. He is 1000% correct about location and drive by, along with the dealer's reputation.
Without the boat on a lot for the touchy feely you will have to rely on the internet. Remember a lot of the boats we sell were not always the boat they were after but saw this "perfect" one. That is why we stock 11 million in inventory.
If you price it right and it is truly clean it will sell and should sell in a month or so. If not your price is too high. September is always slow with the kids going back to school. Not just boat sales but everything. It will kick up big time after Ft. Lauderdale. Your market will be down here as most up north are putting everything away for the winter.