72 K-10 Front Brake Line Question

[azsmokey]

After replacing all the OEM lines in our build with stainless hard lines, doing a rear disc brake swap and adding braided 4" lift lines to the front, we are still having issues with the front brake lines leaking at the crush washers. I have replaced them several times and tightened them as tight as I dare, yet after brake pressure, they still have a slow leak. The rear lines are fine but the front lines persist. I was told that one crush washer goes between the caliper and the line and the other between the line and the banjo bolt.

Does anyone have any ideas? I dont think I can get these any tighter and am not sure I care to!

Thanks