I think a lot of this concussion is magnified when shooting off a bench. It makes it far worse then if you were able to get the muzzle off the bench. And, often when shooting off a bench, you are also under a roof which makes it even worse. And, often on a concrete pad, which doesn't help.
First time I stuck a Miculek brake on my rifle it felt like someone was smacking me with a 2x4! And I was shooting off a bench. I couldn't tolerate it. Sold it to Booger!
But I only shoot AR's off benches to sight them in. Once I started competing for fun it became apparent I would need to get used to the blast. It's a huge advantage and a good brake will cut the recoil 70% or more. Doesn't mean much off a bench, but it sure means a ton when the object is to put 2 shots on paper as fast as you can as you run by! Running around in a match you don't even notice it. Plus, I often double up my ear protection.
But it's an odd feeling hearing a gun go WHAM and getting SMACKED with concussion, while feeling almost no recoil. Kinda like a Major Open pistol.
But for a precision rifle, I'd be looking for something a little quieter, too. But you might also try plugs and muffs to see if that helps. The Epsilon might be a good choice, but it does have a little blast.