Some things to check would be:
1. Are all of the hose sections properly connected?
2. Is the hose properly connected to the skimmer?
3. Is there any large debris obstructing flow at the cleaner?
4. Backwash the filter and observe for continued operation.
If all of this fails, I would conclude that the cleaner needs repair or replacement. Your pump/filter combo is very similar to what I'm using and I've had no issue with sufficient suction power. Before buying my Pentair GW8000 Kreepy Krauly Lil Shark that I'm currently using I had a Baracuda Ranger ($130). The Baracuda worked fine until the diaphragm wore out after 2 years. I decided to change models for no other reason.
1. Are all of the hose sections properly connected?
2. Is the hose properly connected to the skimmer?
3. Is there any large debris obstructing flow at the cleaner?
4. Backwash the filter and observe for continued operation.
If all of this fails, I would conclude that the cleaner needs repair or replacement. Your pump/filter combo is very similar to what I'm using and I've had no issue with sufficient suction power. Before buying my Pentair GW8000 Kreepy Krauly Lil Shark that I'm currently using I had a Baracuda Ranger ($130). The Baracuda worked fine until the diaphragm wore out after 2 years. I decided to change models for no other reason.