I don't have any experience with pellet cookers, so I can't speak on your set up. I have had temperature issues in my RF cookers and usually found that it was bad readings from my thermometers. Have you tried using a maverick or a reliable digital thermometer and checked the internal readings in different places ? Is it hotter up top or down on the bottom ?
Check the temp with an accurate digital probe where the thermocouple from the Smoke Daddy is mounted. My door thermometer will give me different temps based on where my probe is, how much food is near it, etc. There aren't a lot of pellet guys on here so you might be on your own.
If it's tourist season, how come I can't shoot 'em?
Is your smoker running hotter than what the temperature on the display shows?
I have the same problem, same smoke daddy setup. I tested the smoke daddy probe in boiling water, full boil it reads 208-211 degrees.
Ended up using another temp probe that is trusted and adjust the set point to get the temp wanted. 210 to 215 on the set point gets me 230-235.