Have you tried telling it:

“Write perfect code, make no mistakes”

I use this one in my Ralph Harness all the time, it’s a classic!

It’s not that it can’t do that, it’s just that you haven’t told it to!

That's not what this is. Refactors are necessary because LLMs tend to bloat even with controls against it, but it's ok to make mistakes if they can be easily fixed.