The 410c board was not designed for minimal suspend current, it was designed for minimal cost. Not all of the circuits get shut down when the board is ‘sleeping’. As an example:The USB Hub is always powered up, and is linear regulated from the 3.7V (always on, and there is no way to switch it off, 20mA). The ADV7533 DSI to HDMI bridge chip is never powered down and it is also powered from the core supply, so it is always drawing power (about 50mA). The USB Hub and the ADV7533 are most of your power consumption.
It may be possible to change the software to power down the ADV7533, but the current Android and Linux builds do not power it down. The current Linux software has very little power optimization (still on the todo list) so I would expect the Android builds to do better.
You need to go through all of the components on the board to find what is still powered up and actually drawing power, it is not necessarily the chipset drawing the power. Other things to look at , LEDs, I2C pull up resistors, every GPIO needs to be set to low current, battery ID circuit, battery thermistor, SDCard, MIPI-DSI switch, etc.
Due to the design, you will not be able to achieve the minimum possible power consumption on the 410c board, you will need to design a custom board.
Full Disclosure: I am an employee of Qualcomm Canada, any opinions I may have expressed in this or any other post may not reflect the opinion of my employer.