Most of the time those "Random torp" is not really random, watch out where is your team behind you. Those torps would be ment for your team and you are just in the way. Usually I like to set up at a different location to my team meaning if they go left of the cap, I plan to stay more towards to the right. Also, since I mostly play IJN DD, I like to have my rear facing the enemy, that helps me to accerlate away from danger and have most of my guns facing the enemy.
All my IJN DD from T7+ has 70% or more survival rate so far. So trust me on this. Try not to position yourself between your team and the enemy, you will take a lot less "random torp".