@gloaming thank you for the advice, I appreciate it. It's not like me to be anxious but as I was curious and started digging, I found a few posts on this site that gave me pause. But I am also not one to go the denial path or put off my health, so I do see the value in proceeding.
Side note--I also had a calcium score of zero 2 years ago, so I have a lower concern of anything being found--but nothing yet has explained my heart's weakened EF.