Perhaps if more folks want to comment here to say that they found this fight easy, they could also give a hint or two about how they approached it that might help the OP or others?
Perhaps the people complaining could start pointing where their approach failed to begin with.
Because the problem with these RECURRING threads is always the same: that they don't come with a request of help but as a COMPLAINT that the game is supposed to be unfair.
Guess what? If people are playing this at Tactician and getting on just fine, there's simply NO ROOM to give credibility to any complaint that the game is too punishing at easier difficulty levels.
Anyway I wouldn't even know what to tell the guy since I didn't have exactly to come up with the most sophisticated tactic. Even just having someone in your party holding the Blood of Lathander is enough to put your entire team at a clear advantage.