Yo, i personally love the Qwen2.5-coder line of models. I use it to adversarially look at code from other models very frequently. with your setup you could use Qwen/Qwen2.5-Coder-14B-Instruct-GGUF and use the q5_0.gguf quantized version. As far as configs go you could set:
Temperature 0.6
Top_P 1.0
Min_P 0
Alternatives you could use would be:
DeepSeek-Coder-V2-Lite-Instruct
Qwen2.5-Coder-7B Q8
For 31b models to fit with your hardware you would have to use q3 quants and the quality is not going to be the greatest. Alternatively you could look into using a service like Modal. They offer free GPU credits monthly. You can run an app as a shell and use ollama through their GPaaS. This gives you varying GPU's with VRAM that will fit to specific models you're looking for. But if completely local is what you want the models I've listed above should fit your needs.