Redoing A Disk Brake Swap (got leaks/need input/help)

Seals at flare connections have to deform on both sides to seal correctly -> so stainless steel really doesn't do that, you have to look now and see if the cone is smashed in the connection to the brake tube in a strange way. And if it does, it's junk. This is why you don't see materials like this on production cars.

For the crush washer, the washers either aren't soft enough or something isn't flat.