And you made sure there were no dowel pins in the China wall, right? Is it just RTV on the China wall, or a Gasket too? Cork?
Just asking so the basics are out of the way.
What heads do you have? I'm running the tfs heads and with a standard 3/8 wrench I've determined I cannot strip the threads in them, LOL.
Did you dry fit the manifold before install and do some checks with a feeler at the head interface?
If it's weeping to the outside, I'd be worried how much is going inside. Typically the Gasket won't weep on-end, what you're seeing is migration of the glycol through a gap which then wets the Gasket surface as things evaporate. Might be worth tapping on choice areas of the manifold with a soft face hammer and then retorquing the bolts around the water passages. I'd look up the factory torque for those specific bolts and use that as an upper limit.