Sometimes the starsan isn't bubbly enough for a slow leak. Try looking up recipes for home made bubbles with Dawn dishwashing liquid, or get a commercial leak detection fluid. Also try cranking your gas psi up when you test for the leaks, like maybe to 25 or 30 psi. Slop the bubble solution on all your connection points with a small acid brush if you have one.
Best of luck. Leak hunting sucks.
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