@SouthernBee
As a southern cook (GA), medium high heat is too hot which leads to the shrinking into a ball.
Once you brown your hamburger steaks on medium and prepare the gravy, return the steaks to the gravy, cover and bring it to a slow simmer on low, splashing the gravy over them occasionally for maybe 5 minutes.
At this point, they're cooked and just serve! HTH!
You never know how strong you are until being strong is the only choice you have.