OP you took on a lot of work for little gain in my opinion :/
The reality is you can move the cast bar to where you can see it. You can also focus target Titan to watch for casts. Of course neither of these things are necessary if you know titan's rotation. It doesn't change.
When you do Titan enough times you know when to clear away and when to cluster up. Knowing that not all players can understand why we stack just know that if that one guy is standing south of the cluster of players -your running North when plumes it.
Fight is not broken and they've actually increased the reaction time players get for plumes so I do believe the point is moot.