Polaris booster pump hose needs help

We've got a bad connection where our Polaris booster pump flexible hose meets the PVC return line. When I turn on the Polaris, we first got drips but are now getting a fine misty spray.

The hose has been disconnected and we've tried to reconnect it according to the initial installation instructions. Pulling and twisting the sleeve of the quick connect over the hose has been a bit of a problem, as there's another PVC line that runs above this connection, making it difficult to get your hands in place to pull up very far. Still, I thought we had a good connection, but it only lasted an hour or so and then was leaking again.

Any tricks of the trade we could use to get this reconnected and our cleaner operational again??? Do we need a new sleeve? New hose? Thanks.

BTW, our set-up is 2 years old (3rd summer), out in the elements, and gets a lot of use year-round, as we don't close the pool. I also posted this over on troublefreepools, so no need to respond in 2 places.