OldGuy43
Garden Ornament
You may be a bit short. A single fence about 10' tall would probably be 99% effective. I've seen them clear an 8' fence with room to spare. Another possibility would be adding a shorter fence, 4-5' high about 3-5' outside of your taller one. It has been my experience that deer can jump high and they can jump far, but they can't jump high and far in one leap. Streamers of aluminum foil every few feet might insure that they can see both fences.