I’ve got a homemade wood stove it’s a box type stove with a 6” flue on it! I feel the box produces way to much heat for flue! Negative draft and flue pipe is cold! Creosote running down pipe! Had a warm morning stove for 30 years with 6” flue! Never ever had problem. It has a baffle plate but removed it! I’m thinking of using firebrick to make inside of box smaller or possibly going to 8x6 increases inside house to promote flow of exhaust! I feel the firebox produces to mich fire for flue to exhaust correctly