I don't think there's an obvious right answer here, no solution is perfect and what's best depends on your priorities (i.e., fewer connections vs. better seat vs. better flight time).
I do like this one though:
Originally Posted by
sammybk
My suggestion - backtrack to LAX for the 748 to FRA and try for a GPU upgrade. You will need to get to LAX early, but you are guaranteed LH new C, with the chance at F.
Downsides are a long layover at LAX, plus the pain of changing terminals at LAX.
I don't mind the terminal change at LAX so long as there's sufficient time for the connection. It's a pleasant walk on the top level and the new *A lounge (use the J side, not the F side) is awesome.