I've had fun putting "always say X instead of 'You're absolutely right'" in my llm instructions file, it seems to listen most of the time. For a while I made it 'You're absolutely goddamn right' which was slightly more palatable for some reason.
So better than "I'm thinking of solving x by doing y" is "What do you think about solving x by doing y" but better still is "how can x be solved?" and only mention "y" if it's spinning its wheels.