Always have 8 cannons and 12 people helping reload and aim, we have already tamed 3 of these guys with this method, best way to get the cannons there is either by Quetz or by paracer as you will need 4 Quetz or 3 paracer or if you want to do the wait use 2 Broncos with 4 cannons each.
You hit it with cannons on a quetzal. Go for it’s head. It’s torpor won’t drain either so take your time. They can’t eat just stuff a platform saddle on the titan once KO’ed. You use daedons to heal it when it’s food level is low.
If you try taming these guys, tame a Quetzal first and equip it with a platform saddle. Then, put 2 storage boxes on it and a cannon. Make sure you make LOTS of cannon balls. Then, shoot the titan in the head.