Good News!! This has been a long time coming.. congratulations.
Don't forget that you have a pretty small fire, and you are extracting heat from a very efficient stove. So it will take a while to heat the 30 gallons of water... But you do want the extra heat storage, it will take some time for it to get up to temperature, but without the buffering effect of the storage tank, you will find yourself in warm weather having problems with boiling water, having to dump heat, or have the PRV opening..
Give it time to settle down and for you to learn how much heat it can recover and store, and how effective it is heating the 700sqft space..
Looking forward to the photos..