Now I am not saying don't change your spec because I don't care what you run, but please don't give advice saying that s/s is better than a 2-hander in rvr because it is not. Stop telling new people that knights should go s/s in a bomb group because that quite possibly could be the stupidest thing I have ever heard. To even think about being competitive in rvr with s s/s you need to be high renown with the best gear in the game otherwise it is pointless and you will be ignored.
If you want to be a tank in rvr then you want to run a 2 hander and do damage. If you are running a s/s then you will be ignored which is not what you want. Instead do damage, run in with a mdps and throw guard on him. Assist him on what ever target he is on. Stand out in battle with a 2 hander. If you are a threat then you will get targeted which is what you want.