if you are trying the 45 second kill strat its not as easy as the videos make it look. First there is a bit of luck involved, if he comes too close to you guys (especially walking up into the stairs area) its almost certainly a wipe. You can mitigate this somewhat by firing rockets at him ASAP, they sort of stagger him and keep him from running up too far forward but luck is involved. If you wait too long though he almost certainly will always run up and smash your face in, one person should be in charge of shotgunning servitor while other 2 get into position (with bubble) and fire rockets immediately.
Second you can wipe easy just by having a shank (or teammate) run in front as you are firing a rocket, it helps establishing positions early but not against NPCs.
Third its really dependent on people firing their rockets as fast as possible, you need to down him before the first mine is at 15 seconds or the mines will wipe you. You can try to get around this by having one person start heading to the mines at 12-15 secs but then you have less dmg on him and that person is exposed to crossfire. You can of course opt to split the strat and galla him to 20-50% then go deal with the mines and swap poison and then return to rocketing him, but again the adds can murder you without titan bubbles.
Lastly while it is doable with 2 gallas and a hunger its pretty tough with even just 3 gjallahorns, takes a lot of practice in getting that rapid launching of rockets smoothly done between 3 people. Also be sure to aim the rockets in, they seem to land much faster and reliably rather than hipfiring. As people have noted as well, blessing of light is fine don't need weapons the boost they give gjalla is trivial (like 3290 to 3406 initial impact, no change on wolf packs).
Lastly it is easier with 2 titans since the first bubble will almost always run out (even with bastion) right at the end, unless your group is really fast with firing rockets.