I would go with a new hole all together. The only way to get past that point if it is gravel would be to use more weight. Going with a fresh hole would also give you a frsh zone to be drawing water from. Overtime the outside area around the well screen can collect alot of fines and even oxidized iron that plugs up the pore spaces in between the sediment. Even going deeper beyond that zone the sediment that is plugged up above it would still have an influence on production. I would move away from your original spot atleast 10'. I hope that makes sense to you.