WHAT??
Do you mean soot is there during operation, or soot gets there during the cleaning process?
There should be 0, that is an absolute ZERO gas or particle matter coming into your house from the stove, during operation of the stove. The only time you should ever have even the slightest chance of particle matter or fumes of any kind entering your house is when you open the door either to clean or for that very few seconds to scrape the burn pot while in operation. Even if you do not run an OAK, nothing should ever enter your house from the stove during operation.
So if you are seeing particulate matter that you believe is from the stove, in your house, on your furniture, during stove operation, please stop using the stove until you resolve this issue.
If however, this soot is clouding up when you open the door and begin cleaning, it likely can be your vacuum choice. If you use a vacuum that has a larger micron filter, or one that cannot trap very fine particulates, the vacuum can blow a bunch of what you pull from the stove back into the house.
But if you burn decent pellets and set the stove properly for those pellets, you should not need to clean the stove for several days or even a week.
IMO.