Skolas is haaaard without 3 gjallahorns damn, we almost had him again, less than 10% and we panicked when the mines started showing up. Seems like there is too much RNG of whether he chases you or not in the beginning, when he gets too close to us it's only bad news.
A mistake people are making is waiting until the servitor is down before firing rockets. You want 1 person (non titan) with a solar shotgun who is going to go up and shotgun the servitor. The other two run to the base of that platform stairs and start shooting gallahorns at the boss, even before the servitor is down and the buff damage is given. The reason is that it starts staggering the boss so he doesn't come as close to the team as he would if you wait a little while before shooting.
It should basically be servitor shotgun guy out in front, titan in second, third guy. While servitor guy is jumping up to shotgun, titan drops a bubble, and 3d guy is gallahorning boss. You now have a rocket pattern of 3d guy, titan, guy on stairs all shooting at slightly different times so the boss doesn't move or teleport much. You especially don't want a 10 second downtime of everyone synth'ing at the same time, instead the bottom two guys are synthing while the stairs guy is still shooting, then stairs guy shoots.
With all 34s and max gallahorns it took us around 30 gallahorn rockets to kill him off, I still had 4 rockets left on my synth and the other guys did too. At 12 seconds left on mine (if its B spot) the guy on stairs moves to it while the other two keeps gallahorning the boss. We also moved up the stairs a bit if the boss ends up closer to us.
Its still a bit RNG and luck dependent, but you can definitely keep the boss away from you the faster you start shooting gallahorns and not sync'ing your firing pattern so that the rockets land in succession, and so that everyone isn't synthing at the same time. but yeah while its doable with two 34s and a 33 or two gallahorns and a hunger, its frustratingly difficult and slightly easier with three 34s and all gallahorns.