OP, an you change to the NRT-ORD flight to get the afternoon departure?
I've done split cabin RT's a lot.
I usually treat myself to F departing Tokyo.
I love ANA's Z checkin area at NRT and the private security for F pax.
Granted, sleeping is the major activity on the eastbound flights, and I sleep well in both Business and First. But I still love F departing Japan.
Note that ANA's only fault is the terrible PJ's in F. I greatly prefer my CX or JL PJ's.