That filtration system should be taking all of the tar out. it is massive with multiple cyclones.
I was just thinking like ring with rods that can fall into it for a stirrer.
You could be operating it wrong. It might be designed to run as an open top gasifier like the Drizzler, you need a bed of char build up underneath to get it to work right. Then, you have to be careful about the feed rate so you maintain the fire on top… You might not have enough char built up. Rice hulls have a really high ash content which causes bridging well.