You obviously are still young and undamaged. When you get to be 50 with degenerative disc disease you will kill for those stout little 14 hand ponies that are strong enough to carry you all day and you don't have to climb onto a ladder to get up on them.
I have a Shetfindors, which are a mix of Shetland, Finn, and Dorset. They have good milk production but their teats are a bit small. I also have two ewes who are 1/2 Dorset and 1/4 E.Fresian, 1/4 Lacune. Both the E. Fresian and the Lacune are dairy sheep. I am keeping a ram lamb by my senior...
Try clicker training them. How to Clicker Train Your Horse is a good book that can be bought on Amazon and will work with sheep too. There are even some videos on YouTube of a clicker trained sheep.:D