I know of a very shallow down-flat thats about 20 feet of down to 12 feet of flat with a good runout.
I also know of an amazing pair of down flat downs. They're tricky though. You can either go right foot forward or lip left foot forward on the rail on the left, which has about a 20 foot drop off one side at the very top. or you can go lip right foot forward on or left foot forward on to the one on the right, which is fairly low consequence due a grass hill.
PM me if you want to go hit them.
Also, I don't know if your bungee is good enough, but I know of an amazing wallride that could also be a 10 foot wide creek transfer.