Dont know if you have any tips for that. It seems that my summonings just wait there until i get hit to attack the enemy. This is annoying because there are certain creatures like bonelords that damage your stats and i dont want to see my strength reduced to zero before my summoning wakes up. Also atronachs are almost useless because they have this powerful fire/frost/storm attack but they will almost certainly damage your health since their attack has an area effect