It appears that the LEV datasheet is missing the "Current Assist Level Command Flag" and the "Current Regenerative Level Command Flag." Simulant+ has these fields and appears to toggle bits 6 and 7 in byte 2 (Travel Mode State) of DataPage 1 (Speed and System Information)
Simulant+ TX pattern toggling the fields
1842484 : Tx: [01][00][98][00][00][04][00][F0]
1887484 : Tx: [01][00][18][00][00][04][00][F0]
2189484 : Tx: [01][00][58][00][00][04][00][F0]
Those bits are labeled as reserved in the current version of the datasheet published (v1.1 in 2011)
Datapage 3 is also likely affected but I did not check.