Is there any tank guide for T9 ?

[Alise]

In order to save my teammates time, I wonder if anybody know any text guide of T9 tank?
Our team is on weekly schedule to practice T9 right now, but the meeting time is very limited per week.
Only want to make sure first of what is a good timing to use defend buff after phase-3 onward. I want to be able to learn buff timing ahead before actually reach it. Because when MT die, party wipe. and I hate to fail the party even if it is the first time to reach there, so I trend to get information ahead before reaching new phase. Is there anybody can help? if no guide available, could you mind make a short explanation of the timing that you do use your buff during p3, p4 that is a success run?

Also, any extra tip would be cool.