" but I double coated the floor " now that you mentioned that I remembered that I did double coat the floor of my Lighthouse (why did I do that ?) so my comments relate to that.
This keeps coming up, but let me assure you that in the right conditions (very large rain drops) you will get some misting through the standard 1.1-1.4 oz silnylon. And no, it isn't condensation coming off the inner of the fly.
In my experience it has not been enough to dampen my down bag.
And yes I have had all night very heavy rain without any misting...