I have tried some new springs but the bouncing continued. I talked to Baker Air Guns and they told me that the valve spring and hammer spring would need to be balanced. I have put new hammer springs in a gun and had no issues so I know it can work so I will just keep looking. What I have noticed is that the hammer spring has a smaller diameter at each end than the middle of the spring and I have had trouble getting a larger spring to evenly contact the hammer. I will look for a washer to place between the hammer and spring.
Thanks
Mark Welker