I have played 2 games recently with an off the top % as simmed by CVCX:

1, +0.91%. 4D - 2 Pile,1 pass RR.
2, +0.51%. 4D - 4 Pile, 1 pass RR.

Both games are in the Continent of Africa but the maximums are not great. There are 7 boxes though.

Best
M