Congrats, What made samson fearful of people? Regardless of that it is good that he is starting to trust again. Have you tried over kill on people coming over and having them give him a tidbit of a treat?...so he can desensetizize from being afraid of people
I have the same issue with my boy but he doesnt try and get away, he will go right after you and potentially bite and isnt fearful. For that reason, I will either leash or crate him if strangers to him are coming over. Door is always locked so people just can wander in.
Good luck with continued success with samson...gutta love those LGD's