bq40z50 Sleep conditions

I want to put the 40z50 into sleep mode with the CHG FET off and the DSG FET on. I've got the following register settings:
DA Config:      0x1A     SLEEP enabled, IN_SYSTEM_SLEEP enabled, REMOVABLE mode, 3 cells.
FET Options:  0x19     CHG FET off during SLEEP.

I've wired the connector to the battery pack so that when it's connected, PRES is grounded.

With the pack disconnected, I measure about 75 µA from the cells, but when I connect it, the current goes closer to NORMAL mode: 450 µA. It stays this way even after waiting the BUS Timeout time.

What condition is not being met to stay in SLEEP mode?

Thanks.

Tom