What is War's best multistep Radiance and how should I approach it because I think I need to open with full TP Upheaval for AM3?
Without Chango, I should be WSing in a Multi-hit set at 1000 tp and with Chango, I should be WSing at ideally 1250 tp with a WSD set right? Would that also apply to King's Justice?
Aeonic's don't need you to store to AM3. Both KJ and Upheaval's damage changes post 2K and they go from a MA set to a WSD set. The actual TP you would use depends on if you have Warcry up or not since that's another 700 TP Bonus.
For Radiance, the "best" 5-step is
King's Justice -> Steel Cyclone -> Upheaval -> King's Justice -> Upheaval
The first Upheaval activates the AM effect, the second consumes it to create Radiance.
Now we can replace Steel Cyclone with Full Break in that series, Full Break inflicts far less damage but comes with the benefit of several debuffs one of which being defense down. Also a 5-step is usually extreme, I've been just shortening it to an easy 4-step by cutting off the initial King's Justice.
Full Break -> Upheaval -> King's Justice -> Upheaval.