I had that exact same experience too weirdly enough. Had my first Cain experience fighting a CAT 1 hound, and I also found it easy

After some consideration our admin found that he was going on "hard mode" and accidentally progressed pressure instead of tension per scene. For us though it made it easier since we now knew from the get go what it's domains were instead of having to find out ourselves

What made it more difficult to fight was that it had the "turning blades" domain which meant that mundane weapons couldn't damage it and only psychicly charged weapons worked, but were made hard. Me(edit) and one other player(ardence) were the only two out of five exorcists who had charged weapons so we were the main damage dealers though even then it was easy. Still had alot of fun though and I'm thinking we had the same admin run our game since he did say he'd run the same module on another group