Assuming that the trophy gain/loss issue is not resolved, and that gain/loss for the event mode is based on Battle mode trophy score alone, I will be using the following strategy for the Test of Might in the upcoming Heroic Adventure:
- Play battle mode until I reach my current season max (3,000)
- Play one match in test of might to lock in my event trophies
- Play battle mode until I reach my previous season max (3,800)
- Play Test of Might mode.
If my assumption is correct, I would minimize the amount of trophies per win in the Test of Might event mode, allowing me to play additional matches at lower levels.
Unfortunately, I don’t know whether the two Test of Might sub events use independent trophy counts.