I have a Enviro Mini stove, It starts up great but does not feed pellets consistently. The auger always turns when it is called on, but pellets do not always drop. II am running pellets that are hardwood and between 1/2-3/4 of an inch long, Very consistent in size. The fire will burn down to maybe 1/2-1 inch tall flames than a bunch of pellets will fall at once and the flames become large up to 10in tall and than back down to small and so on. I can only adjust the auger trim on low and does not seem to make much diff. The dampener is set so that the flame is not torch like nor is it lazy. Is this how these stoves burn or is something wrong? What am I missing?