Yup, splitting the toolbar into two new toolbars did the trick. I thought I had already tried that, but if I did, I did something goofy that prevented things from working. This time all went smoothly in less than 30 seconds.
Thank you!
Regarding the Up button with respect to the URL bar, I solved that challenge after I posted my question.
I merely moved the button to the Main toolbar and placed the button to the far right, which visually in my configuration, places the button to the immediate left of the URL bar.