I had 2 problems with the tanking in the final phase making us miss nearly all pillars

1) Finding the pillars without losing orientation.

Found the solution to that myself now though. Apparently there's an option for max zoom rate which was only at 19% for me.

2) Holding aggro.

I do the exact same thing as on other bosses which is spamming project and slow time (+15% aggro and high aggro attacks) yet for some reason I kept losing aggro to mostly healers but even a dps at some point.
Posotioning Soa under a pillar with only 6seconds of taunt and 6optional seconds of aoe taunt was just impossible. Any ideas as to why I couldn't hold threat?

I had the same problem with Threat on Soa, Princess. It seems that others can still gain threat when he has the shield, but i could never keep it myself. However with my single target taunt I could generally keep him for 4-6 seconds past the duration, and use the AoE taunt to bridge the gap. I don't think there is any real way to tank him without taunt, or so it seems.

All right, guess the problem was just my orientation due to camera then. Should be better next time then.

I just use taunt when hes about to stand up but the dps shouldnt be hitting him when he has the shield so you only need to worry about healers and your double strike, project, slow time, force breach should hold aggro off them while you back peddle to the pillars