Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community - FT86CLUB - SS brake line install

I'm posting this here because the initial DIY thread isn't getting much love, but I'll probably repost in the DIY subforum.

TL;DR I started the installation of some braided SS hoses today. I worked from the back towards the driver font. Bled everything and noticed the driver front is still leaking.

Everything went really smoothly until we got to the driver front connection. The 10mm nut on the hardline connection was tight. But I mean seriously tight. After we eventually busted it loose with a strong grip on the hose and a lot of swearing, we did that line, bled it, and thought we were done. But there is still a slow leak on the softline-hardline connection.

Now I'm thinking that the reason it was so tight was because whoever fitted it originally overcompensated for something. The rest all felt consistent - it was just this one that was ridiculous. It doesn't matter how tight we fit it, there is still a leak, so I think the hardline might be bent and not lining up with the hose on the inside. Maybe the original overtightening caused the hardline to kink and now it won't go back to the exact fitment.

Also - these connections do not have to be that tight. The other ones were barely more than hand tight and they sealed up nicely.

My current ideas for troubleshooting this further:

Try fit the old rubber hose and check for leaks
Remove the other front SS hose, fit it, and check for leaks
Threadlocker on the hardline bolt to get a better seal
???

I'd really hate to crawl to the dealer with my tail between my legs and ask them to replace the hardline out of my own pocket (if they even agree to do the work). On that note - how dangerous would it be to drive with a slow leak? I'm assuming quite dangerous, but when we bled it, there was good pressure going through the entire line.

If anyone has any suggestions as to what to try, or who to ask, I'd appreciate it a lot.