The best I can tell you is to just take your time, and work with the stove.
Read the manual again, trust the start up sequence for the most part.
Make sure your wood is <20% moisture content. I know you said yours was dry wood, but my neighbors definition of dry wood is wood that was split last week that isn't wet from the rain. That wood would NEVER burn in my stove, ever. Well, it might but Id be paying for it. Bring a few larger pieces in from the cold for 24 hours, split in half then measure the MC of the wood just to be sure.
It sounds like you may have a draft issue honestly based on what you are describing. While it could be the stove, what happens when you have the damper open and the air control wide open?
These are little stoves. While many will say they heat their entire home, my cabin is too leaky and spread out rather than air tight and built vertical. BUT, it will heat me out of a 670 sq ft room with cathedral ceilings, keep the adjacent two rooms at a tolerable (with blankets) temperatures. Once it gets going and stays going. I expected a bit more, but it is what it is. I loaded 4 medium/large pieces of oak Saturday morning ish (10:30am?) and had that room at 76, the adjacent room at 70, and it remained like that until we ate dinner. That's pretty damn good when it was 16 degrees outside.
Yes, it is still a sometimes challenging stove to operate but over time you will get adjusted to its quirks. I still cannot have anyone else operate the stove which in the end may be the demise of the stove at the end of the year, but for me as long as I dont go far after a reload for a couple of hours, I can then walk away from it at a certain setting for hours. Would I trust it to leave it alone for 8 hours, yes only if I had it burning low. But you would need to learn the stove and how it reacts to how you load it as well as how big of pieces you are using.
I also find that using larger splits makes it more predictable. You can throw a medium or two in there as well, it wont hurt but for example if you load it with nothing but smaller/medium pieces and walk away after 30 minutes thinking that will be the steady state burn, you will quickly smell the smell of an overheated stove and maybe a burning plastic smell from the overheated stove pipe. You must learn how the stove will react to different wood. And it will overheat quickly. At least mine does.
I have a 15' from stove top chimney to cap. Live in a valley of two tight mountains near three bodies of water (one river, one stream, one pond). I have sub optimal conditions I believe for burning with this stove, and am making it work ok. If I can you can.
Im not saying the stove is good, great, or even acceptable in comparison to other products, Im saying you can make it acceptable and at times you might even like it (then the next day it will do something to make you hate it again though)