JA600L
Minister of Fire
Well the metal cat is in a second chamber. You engage it by pulling a lever which redirects the gasses through it. I will try load it up with all large split and see if that makes any difference, thanks!
Correct me if I'm wrong, but if your reloading before your coals burn down with hardwoods, chances are half of your firebox is coals and ash. This stoves retains coals very well. Make sure you are keeping it cleaned out so you can load on full capacity. Also, I would try to burn some softwood in between to bring down the coals and raise the stove temps before your next big load.
I ran loads of locust through mine during the coldest months and found I had her all plugged up and my burn times dived. I cleaned it out good and felt like I had a new stove.