Advice on securing a Oceania Defence Muzzle Brake onto a thread

[308mate]

Mine arrived today. I received the 2 port compensator instead of the muzzle brake because they ran out of the stock recently. The manual says you could use shim and optionally red loctite if needed. I've heard people saying using crush washer with suppressor is bad so I went to shims and loctite option straightaway.

Quite interested to know how bad the noise and blast on this is without the suppressor. I considered the two port but was put off it by a few guys on here. I still like the idea of it though.