Both models on high are kinda bugged and don't give better results. Use them on low, unless you are generating images/art/design.

The exact quant is mentioned on model page[0] IQ3_S, and I think 27b was Q4, via Ollama, the one that fits on a 3090 24GB

[0]: https://aibenchy.com/model/qwen-qwen3-8-flash-next-low/