Just finished Tactition mode myself. Not really impressed with the difficulty increase overall. Yes, enemies did try to CC me a good bit, Archers used Knockdown and Ice arrows (but NEVER static cloud) frequently, usually on their first turn. Still, by the time I got out of cyseal I had everything under control. Most enemies never even got a turn after that, including the bosses. I never really noticed much in the way of additional enemy spawns outside Cyseal either, it really feels like they put all the difficulty into the first area, which was already probably too hard especially by comparison to the rest of the game.
Two warriors, Jahan and Bairdotr. So many times did I wonder why I even bothered with Jahan, magic was useless until I had the level 15 rain spells, and even then it was only just barely competitive with my (admittedly broken as hell by that point.) other party members.
Here's a video showing the short work I made of the Void Dragon. This is just pathetic for a final boss. Again, remember this is on tactician mode.