NEVER RESTRICT IMPEDE OR STOP WASTE WATER FLOW OF YOUR SYSTEM said:kinda made me feel uneasy about continuing to see what happens. I was thinking maybe its the ASOV that's acting up, since its purpose is to stop anything from flowing in the last chamber if the pressure increases in the output.
BTW it does have a valve on the waste line (flow restrictor I guess) but even when its completely closed (at right angle to the line) the waste water is still dripping.