You might try blowing the tire up quite a bit. 50psi or above. Let it sit for a few minutes and then let it back down. The bead might not be seated exactly right and your leaking slowly.
My right front has been leaking slowly for the past couple of years and I haven't figured out exactly why. Not as much as yours, but still leaking.
You might also check the valve core. I just bought a core tool to make sure mine was tight.
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Borla S-Type | Motordyne | Z1 (lots) | South Bend | K&N | Nismo/Nismo S-Tune | Eibach | Aerojacket | Fujimara | Spl | ZSpeed Performance | Kenwood-Infinity-Sound Ordnance | Whiteline | Ecutek | Hotchkis | Clazzio | VQ Vortex |Morimoto XB |Dynosty Tune 329.64hp 265.73 ft/lb
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