Max miles and max tier points may not be the same. But something like this might get you max tier points:

CAI-LHR BA 180
LHR-EZE BA 180
EZE-GRU BA 180
GRU-EZE BA 180
EZE-GRU BA 180
GRU-MIA AA 180

(Separate R/T MIA-NAS)

NAS-PLS BA 180
PLS-NAS BA 180
NAS-GCM BA 180
GCM-NAS BA 180

MIA-LAX AA 180
LAX-HKG CX 180
HKG-CGK CX 180
CGK-HKG CX 180
HKG-CTS CX 180
CTS-HKG CX 180
HKG-LHR BA 180
LHR-DOH BA 180
DOH-BAH BA 180
BAH-DOH BA 180