Harness: Am I doing something wrong? Or are my expectations unreasonable

A user is experiencing difficulties with Harness, specifically when using qwen 3.6 and 3.8 q5 models with a 64k context for a simple web app. They report issues like looping, forgetting tasks, and UI errors, despite trying various configurations such as enabling/disabling thinking and changing quants. The user is seeking advice from others who have successfully used Harness, particularly regarding their setup and reasoning, as they have a 3090 GPU and 48GB of RAM.