How late will you be staying? Just because the crowd is Level 8 during the day doesn't mean it will be Level 8 at night. Lines are always much shorter during the last 3-4 hours of operation when guests start lining up for the parades or simply get tired and leave.
Here's an example of what we were able to accomplish on a recent trip in just 4 hours. (8 pm - midnight) with no FP+. This was a crowd level 8 day, but we found bumper to bumper traffic leaving the park when we arrived.
Big Thunder 3x
Splash Mtn 2x
Space Mtn 2x
Mine Train (10 min wait right a closing time)
Pirates
Jungle Cruise
Haunted Mansion
Pooh
Peter Pan
Speedway
Barnstormer 2x
We also watched the parade and fireworks and had a couple of Dole Whips.