Hi
Read the masterclass article by Bill Vicenzino about Lateral Epidonylalgia.
I am pretty sure that the ones you quoted are the ones to use.
What else is there? Pain is important to people, function is even more important to people, grip strength is functional.
Perhaps pressure pain threshold is a good one to use, esp if using acupuncture because of the proposed neurophysiological effects. See PPT in the article.
Otherwise PEDRO and Cochrane etc would be another place to look.
Good Luck!