Using the ring of fire or Minion method, I have found I need to do two things to get to higher temperature: Open the vent on the unit one to two more clicks (at two or three), and open the top vent a bit more.
I use the vents on the pit to run the temperature to about 30 to 40 degrees of target and then clamp down the bottom vent and start the iq110. The top vent is partially closed. As it reaches temp, I leave the top vent open a crack (I use it on an Akorn Kamado) and it will settle in around 235 to 250 without problems.
If I need to run it up to 300 plus, I will open the vent on the ip110 to at least 3, if not four, open up the top vent some, let it run to temperature, and then bring the iq back to opening 2 and either leave the top vent where it is or close it slightly. It takes a lot more air to keep the hotter fire going. Once there and the iq vent is set to provide enough air, I have never had a problem maintaining temperature.
Regards, Riz58 Char Broil Akorn, Primo, custom-built, and Masterbuilt Electric Smoker