You might want to cross post in laundry:

Here is a link that might be useful: laundry forum

The problem with these (infuser) is not necessary the amount of water, though the senors can malfunction, but the motor. A machine like his with a belt and pulley motor the belt will slip trying to turn large loads making it appear the the water level is an issue, some clothes don't get wet and don't come out clean. The 5450 still has senors because it has an "auto fill" option, you will need HE soap with this and will fill on it's own. Previous model senor sometimes came into play even when large was selected. Look at the GTWN2800 series it is a traditional top loader or make sure the HE top loader has a direct drive motor!