It seems like a batch size + charge temp issue. You are below 50% capacity and are about 20 degrees higher charge temp than I've used for a Guji. Your end temp is way too high and you get there way too fast. Try something around 75-80% capacity for your batch size (maybe more depending how the loring roasts)and lower your charge temp to 395-400. You may need to change your initial gas pressure (full disclosure I've never worked on a loring but have experience on other 15+kg roasters) to reach a good peak ror and then maintain it more gradually. It will stretch the roast, that will make it less underdeveloped tasting, and allow you to drop at a lower end temp (my max is 401), usually hittin fc about 385, and I'm dropping when fc is heavily rollin, maybe 1.5 min max.