Recently got a very gently used super gorilla. Practically mint- there wasn't even dust in the filter. It came with a bag gripper which I wired up and it turns on and everything. Its hard for me to tell if its actually working. The bag doesn't seem to suck against the collection bin walls with much force. when I turn it on I can see the bag starting to create a suction but it seems to take FOREVER. Surely you can't be expected to wait 10 minutes for the air between the bag and the bin to evacuate. I have no reference to how they should work. Can anyone give me a baseline on what to expect from the gripper?