Sorry to be so late in posting.
It sounds like you have read about temp settings and pellet feeds but if not look here:
I had a similar problem as described here:
After talking with Cookshack I also readjusted my flue cap and all has been well since.
Lastly if you haven't, a search for LHt/HHt Temp Control on the PG1000 will yield a LOT of information....
Hope this further helps with your journey and you come to love your pellet grill as much as the rest of us do.