Really enjoyed this. I love how practical, humble, and respectful (even of religions, which I really appreciate) uncompromising nihilists tend to be. I happen to be a Christian, so I could go on all day about meaning, but if I could say one thing, it's this:
We all die, and it's more than likely even humanity will die out as well (even if it's at the heat death of the universe). You've pretty much rejected the possibility of true objective meaning, focusing instead on various ways of measuring subjective meaning. But at the end of the day, anything times zero is zero, which is fine if you're a nihilist, I guess. The focus in this framework is on you and your "meaning graph", but cool thing about knowing an ultimate God, is that he's a connection to your graph (both investing in your meaning, and pulling from your meaning via worship), that sticks in a way nothing else can. Christians believe that for folks who don't know Jesus, nihilism is essentially true; Romans 4:17 says, God "gives life to the dead and calls into existence the things that do not exist." From what I can see, He's the only thing/idea/person that has the potential to provide any kind of objective meaning, so however delusional religion may appear (and I'll admit lots of it is deluded), there's only one God, and he is "the rock that is higher than I".