An answer might be difficult because the limited size of the sample.
Since being with Eddy from the early years,the comp cooking of smaller chicken pieces at that temp by some teams was about all you heard with FECs.
Eddy teaches some products cooking from 250º to 275º which is considered hot by many.
There are some of the guys cooking with Kloses, out of central and west TX ,that you run across that may finish as high as 325º.
Most cookoffs,you can wander all day and not find a fast cooker.
First,it is difficult to get any smoke.At 350º it is like cooking in your house oven and basically useful for cooking lean meats without collagen to break down.
Second,with full cookers of any kind you can get grease pooling which can start a fire.
The one cook that teaches hot/fast,probably has some followers.He is braising/steaming meats.
The cooks we know, take his course for his hog techniques- which are low and slow.He does hot cook some shoulders,but cooks we know don't use that area of his cooking.
Sorry to slide off topic,but hope this helps a little.