The antonyms for the phrase "more improv" would be words such as "less structured," "less spontaneous," "less creative," "less innovative," "less imaginative," "less original," "less daring," and "less unconventional." These antonyms imply a decrease in the level of improvisation, either in terms of the method or the outcome. For instance, a scripted show would have less improvisation than an unscripted one, while a conservative approach would have less experimentation than a radical one. Therefore, the antonyms for "more improv" emphasize the importance of balance and variety in artistic expression, and the need to explore different styles and formats to achieve optimal performance.