To help the discussion it would be good to know how many acres the trees are on. Is there an existing logging road system for access. In general, how good is the access to the trees. Medium size trees is clearly a beauty in the eye of the beholder term. what is the DBH (diameter at breast height). How many feet is the trunk before you no longer have two clear sides.
If the 30 trees are spread over 20 or more acres they may have been field grown, meaning they will have fairly short main trunks before large branches start. Obviously that significantly reduces the timber volume. By the way, the oaks that I have with those characteristics are being saved anyway. Their huge crowns produce a ton of acorns in good years.
I certainly agree with getting a professional to assess the trees, and forested acres in general. Any landowners should understand their woodland, which includes current timber value, and management approaches to ensure future timber value.
I used the tours of several private and state foresters on my land to acquire knowledge.
I miss my hunting partner