I'm using focus peaking, and I shoot with the lens stopped down all the time even during framing and focusing. I get confused by having an open/close ring on the lens, and an open/close ring on the Fotasy adapter.
With these 'all manual' lenses I have the viewfinder set to automatically brighten to accommodate the stopped down state of the lens.
These lenses are fun to use and offer unique image qualities I don't think I'd get with the Zuiko lenses.
I'm also experimenting with 'one body', 'one lens' shooting as a result of using these lenses. I select one lens, attach it to the camera and, taking just that I go out and find some way to make that body/lens combination work to make a good photo. . . somehow. If I encounter something I simply CAN'T shoot with the gear I have, I come back another day, with a different lens. I think of this as a 'layered' approach to photography.
I enjoy this sort of shooting so much, I'm thinking of getting a couple of modern Zuiko primes to see how I like shooting wide in this way.
Below, a few examples of what my Canon FL lenses can do. Click on any to enlarge: