I get frustrated with Ben Ambrose. He never presents well. It tends to be herkey-jerky, confusing, and back and forth. He needs to either write a standard stump speech himself or get a professional to write one for him that presents his positions in an organized manner and hits all the high points. This is not only more efficient, it's also more impactful.
Being able to improvise and speak off the cuff is a skill that develops over time with a lot of practice. Some never develop it. Not having at least an outline means that you forget important things and/or go off on tangents that waste time and lessen impact. A stump speech is a mini drama. It should have an arc and acts with scenes that drive home ideas and emotions. People should be cheering with their wallets out at the end.
Ben knows a lot more about the technical details of legislation than the average candidate, but in general, voters are not interested in "sausage making." They are not interested in how it gets done; they want to know that it will get done.