Grk, I'm not quite sure what you're trying do do, and what graph you're speaking of. Hoping that you can give us another clue or two.
Meanwhile, it sounds like you have a problem with your ash dumping. Very low ash fuels might not leave enough material in your burnpot tocarry your fire through the next cycle. This can be fixed by adjusting the ash dump rate, but if you have a 115 or 110 stove, you'd need to connect your stove to a computer with Bixcheck software as explained here.
forum.iburncorn.com/wiki/index.php/BixbyFAQ#BixCheck_Software
First, though, let's start with the easiest thing. Can you verify that the fuel selector switch is set correctly? For pellets, it should be set to Fuel B, Wood.
EDIT: Perhaps it would be best to start a new thread on the subject, so that we don't mess up the present thread on the status of Bixby, the company.