Two thoughts here...
First off, regardless of what you booked, you should track your rental for lower rates by gong to autoslash.com/track or clicking on the tab labeled Track a rental for price drops from our homepage. Prices do often drop as the pickup date approaches, so it's worth using this free service so you'll be notified if a better deal comes along.
Second, there may actually a fairly simple solution to your problem. Can you stay in the Charlotte area the night you fly in and pick up the following morning off-airport in the city of Charlotte? If so, we can get the price down to $765 for you. We've sent an updated quote with this option via email.
If you're not planning on staying in Charlotte the first night, try doing a 1-day one-way rental to wherever you will be during the day on 10/26 and then price a one-way rental from there to CHS as it's likely to be much less expensive that what you were looking at.
Hope this helps. Feel free to PM us if you need additional assistance. Safe travels!