MFSK64L and MFSK128L are fast modes, but with the interleaving, they might be able to withstand the rigors of long distance shortwave.
More information here:
The VOA Radiogram schedule is unchanged in the B13 season:
(all days and times UTC)
Sat 1600-1630 17860 kHz
Sun 0230-0300 5745 kHz
Sun 1300-1330 6095 kHz
Sun 1930-2000 15670 kHz
All via the Edward R. Murrow transmitting station in North Carolina.