Impressive run! you read all Rajang's movements cleverly. And those guard points...hoo boy. I did this quest yesterday with slugger secret + aquashot. Apparently I'm a bad shooter so I ran out of ammo mid-hunt, lol..
Just want to add some info on that. Slugger has a build up effect that once it gets full the monster will be knocked down. So they are different than normal knockdowns and trips. And as the other comment said the impact philes on the CB already have build in Slugger so hell get more knockdowns than he normally would.
That's actually very good, Furious Rajang isn't a Joke so it takes quite some time to take down TWO of them. Other then that, 15 mins is average - pretty damn good time
Even better farm the farewell zinogre event for ores, then hit the steamworks for prints. I did it twice on the second output and got 20 celestial prints.