i have an Ironwood 650. From what I have read and experienced so far, this is common and normal for a pellet grill/smoker. Disappointing because the capacity is there to create the flavors, just need them to fine tune the burn process in the fire pot.
I am the same with my trials so far. I am finding nowhere near the flavor profiles in different woods in pellets compared to the use of wood chunks in my Kamado. Even my Weber charcoal grill imparts more flavor in the cooked foods. I have only gotten one smoke on my Traeger where the smoke flavor was prominent, and that was doing smoked cheese and paprika. Grill was totally off and used a smoke tube only for 4 hours. Makes me wonder if the airflow plays into it. There was no real convection because the fan wasn't on.
I have used the smoke tube in conjunction with meat cooking and it helps a bit in the Traeger. But nowhere near the actual stick wood smokers. I am trying different pellet brands, but I don't think the flavor profiles will ever be achieved to the levels of my Kamado