I agree that the coin-toss is really rough. There are a couple of ways to deal with it.
One is to Guard, before the Coin-toss comes up, this should disable it. I'm not super keen on this method of dealing with the coin-toss, as I think it's a very easy way of removing all the danger involved.
The second way is to avoid the coin-toss by destroying the part of the enemy that causes it. With the guard's, you destroy their left hand (the empty one, not holding a cleaver).
If you feel the game is unbalanced, we are trying to fix it up with a community mod, on the Discord server.
Hope this helps!