With your Touchpad plugged in to the wall charger and charging in CM9, open the terminal emulator app and type su and tap enter. If it asks for super user permissions, allow it. Now type "cat /sys/power/charger/currentlimit" (without the quotes) and tap enter. Note: there is a space between cat and /sys. What result do you get?
If it is charging correctly, you should get a report of 2000mA. What does yours say?