Dan
I have not played Highland Meadow, but it has been recommended to me. In fact the guy who felt Syvania was the equal of Inverness was very high on HM (and not so high on Toledo).
One of the reason there are so many good courses in Ohio is because there are so many medium to large cities. Six different metropolitan areas have hosted major championships and most of them multiple championships: Toledo (Inverness), Cleveland (Canterbury, Country Club), Akron (Firestone), Columbus (Scioto, Columbus, Muifield V), Dayton (Moraine, Miami Valley, NCR) and Cinti (Kenwood). I'm not aware of any state that is close to six. (You can add a number of courses and Youngstown if you consider the old Western Open a major).
These cities were all relatively large and prosperous at the turn and early part of the 20th C. A lot of great architects made there way into the state and hit not only these cities but the next level of towns: Youngstown, Springfield, Newark, Canton, Mansfield, Ashland, Portsmouth, Zanesville, Stuebenville, etc. It would take much time and effort to "do" the entire state of Ohio.