Yep. Small chippers suck.
We have had a couple - my dad was keen - and they have been universally underwhelming. They work well on small stuff that would
compost fairly quickly anyway, but don't cope well with the stuff that is slightly too heavy for easy composting, but is too small for firewood.
These days we make all that stuff into
biochar instead. It works great, provided you can let it dry for a while. I use a trench system which can process a huge amount of material quickly, and with minimal handling and cutting of
feed material.