Colleagues told me my presentations were confusing and rushed, even a bit strange. With two major speaking engagements directly ahead, I went back to my sources and practiced on anyone who would listen. While I hiked in the hills around Phoenix, I thought over different ways to engage my audience and get my ideas across. Consider the inner game. George Bush before coaching as example of how not to do it.
Groups are different from one to one.
Connect with the audience. Deliver a full phrase before turning. Don't shift in mid-phrase. Breathe between phrases. Cite mutual examples.