In my experience with the DeepSeek V4 Pro API 67B, the empty approach is a total disaster for tight deadlines. You end up wasting precious time refactoring its creative but broken logic. Ive tried many variations over the years and found these two paths work best for crushing bugs:

• Strict Senior Engineer: This is my direct recommendation for your sprint. Use a system prompt that specifies language standards and DRY principles. It cuts the fluff and keeps the logic grounded in reality.
• Hybrid Speed Mode: Set the role as an expert but specifically tell it to prioritize execution speed and ignore verbose explanations. I would definitely stick with the strict expert role for your 48 hour window. It reduces the chance of hallucinations which is exactly what you need when youre tired and racing the clock. If you need a specific snippet for your config, let me know. Youll crush those bugs.

Honestly, Ive spent years fighting with prompts during crunch time. Skip the creative stuff, ngl. I always use a 'Test-Driven' role—make it write the test before the fix to stop hallucinations. Alternatively, try 'Context-Heavy' by dumping your whole file tree into the DeepSeek V4 Pro 67B API. TL;DR: Test-Driven for accuracy, Context-Heavy for deep logic. Creative modes just fail when you're on a deadline.

Been using this for years, no complaints