.. AN fitting leak / help please ..

I have installed a fuel cell in my trunk and went with -6 AN Earl's fittings with SS braided hose ..
I like the way the job came out, however I am fighting a very, very small leak in a fitting >> so small it is more like a weeping leak over a week / just leaves a gas-trace on a paper towel left sitting under it > no real puddle ... it's driving me nuts !
I have checked the aluminum taper-interface surfaces and they are good > the hose/fitting interface also seems to be tight / plenty of grip-length on the hose body ID >don't really want to hog down more on tightening the fittings due to the aluminum > and they seem snug enough ...
anybody else ever have this problem >>> and how did you fix it ??..
thanks