To me, this music doesn't match the gameplay and atmosphere. The current music does. It's cool you're not into the current ost, but it does match the feel of the current game.
The music you used felt out of place. Maybe cuz it was Sapienza? Not sure what it was, but it felt like it shouldn't have been there. There are times where a good Jesper Kyd track works. I do use it in some of my cinemtic episodes along with the current ost. But Depending on what's going on, it can feel good or feel off.
Here's what I did with the black hat et. I start by using the current ost, then Jesper comes in, then exit with current ost.