When it comes to exploring something, there are times when you want to be more thorough and detailed in your approach, and other times when you want to be less so. Antonyms for the phrase "more exploratory" include less experimental, less investigative, less inquisitive, less probing, less research-oriented, less investigative, and less exploratory as well. These antonyms may signify that you want to take a more measured and constrained approach to exploring a subject or area, rather than taking a more expansive and unrestrained one. So, it's important to choose the right antonym depending on your needs and goals.