I would recommend that if You do try to use the SD HD with wood in it, that you wrap the wood in aluminum foil and leave the ends of the wrap foil exposed to allow for some controlled ignition of the wood. I would start the grill between 200*-250* degrees and not any higher. Low and Slow bbqing works best when using wood in the SD HD. Once the wood ignites, depending on how well You wrapped the wood chunks and not wood chips, the wood will burn, but with the wrapping, it’s more of a controlled burn and not have your grill in an all out inferno... Will your grills temps rise?? Yes.. Can it be managed? Yes, but it is no ways perfect and can be frustrating to use for some. Propping the grills lid will help allow some of the extra heat to escape as the owners manual states, just know that once there is complete ignition of the wood, the temp will shot up.. and in most cases, a lot.., the aluminum wrapping helps to control that. You can also reach out to SmokeDaddyinc and see if they have any updated steps and instructions for the use of their SD HD and if they do have any additional recommendations, please post them here so others will know. As a Heat Diffuser without wood, the SD HD is very effective and it should last a very long time. Lastly, try Your new Pellet Pro Grill with the SD HD without adding any wood to it and see if you enjoy the flavor profile of your cook... Then on Your following cook, try it with your desired wood chunks and any updated recommendations from SmokeDaddyinc if there’s any or try the aluminum foil wrapping of the wood chunks and give it a shot. Adding wood to it may or may not be for You. Good luck and keep us posted.
Pellet Pro Austin XL and a few more mods... in SoCal and Always... Semper Fi