Frt Leaf sprg 4x4 help

[Murphy IRE]

Here are pics of my current front leaf springs. As always she does fine off road, but on the Hiways, she as a small chatter type bounce/vibration. The driver's side leaf has gone concave and the right side is flat. The rear sets have plenty of spring and have a normal look. Are the front leafs supposed to be flat or are these dead? I had them worked on two years ago, but I think they have lost their spring. Should I replace? I have the std "highboy" suspension. I'm running 255 85r16 tires and I don't have any clearance problems. Thanks in advance.