I got a set of Stainless Steel lines from Classic Tube and they worked very well. I did have a dribble problem because they weren't torqued down all the way (that'll teach me to assume things!), but after I fixed that, they worked like a champ!
So, try adding a little more torque to the party and see if that stops the leaks.
You might try getting a single flare tool and maybe widening out the flare a little bit.
I recently redid half of my steel fuel line so that I could put a filter on, and I found that the flares work best when the flared ends overlap the fittings by a little bit. they seal up really nice and work like a champ.
Good luck!
