BF1983 said:
Bingo!!
I used the same method... But not with Sniper Rifle.
Instead I use Torque bow and hammer him with continuous fire with Lancer when I krylls are away from him. When Kryll returns around him make sure you reload your lancer and switch to torque bow, that way when you get the next window to fire lancer you won't get stuck in middle of firing.
And yes... keep your ass moving.
Another way I got to him was to get him away from the platform with Troika, then quickly sneak past him to grab Troika. All this after you take care of Reavers and hammered RAAM for a while. Once you are on troika, make as much as use of it as you can, but you need to be very quick to let go and take care from incoming krylls. It's an extremely risky method but as evident Troika can make much more damage to him than Lancer firings. When krylls approch you, take cover in light and use torque bow to keep hiting. I won't expect anyone to get successfull with this method in first try at least, unless you have already made too much damage to RAAM. It took me 4 tries with this method.