On my Summary line is there any way to make the appearance cleaner? The Project 8 and Project 10 symbols are overlapping:
Your schedule is outlined and using Milestones Professional's Summary Bar option, Split Summary Bars using Lower Level Symbols and Bars.
Another option is to set up your toolbox to use symbols number 47 and 48, which are two smaller triangles. Then, stagger the triangles as shown so that the summary bar is not crowded: