If you want yo can change over to braided at the ends of the steel lines then that will give you some flex and vibration resistance ... use compression fittings on the steel  That's the direction I've decided to go. Need to see what fittings I have on hand, plus don't believe there's enough -6 line left to do the job.
2021 Challenger 6.4L Scat Pack 1320
100% stock: 1.680, 11.894 at 113.75 (DA 175 ft)
weight reduction, wheels, tires, Hellcat air box: 1.661, 11.686 at 115.97 (DA 710 ft)
1973 Challenger 452 ci street/strip [2008]
pump gas, DOT radials: 1.454, 10.523 at 126.44 (DA 514 ft)
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