Are you sure the QUAUP->A counts for a three class plane? I thought those fares specifically excluded flight numbers that were operated by three class planes.

Edited to add: I just tried this myself (Sept 1 out / Sept 5 ret) and got a fare of $1,088 for F on the three class 777.

Best part about this was that Business priced at $3,900 since the F is a QUAUP and the Biz is a C!!!!!!! HAHAHA!