I agree entirely with @ar-ninetysix and @Penni ! Everyone has a good point.
When writing you have to do what feels right for you, but also for your plot overall, which (at least for me) is hard. Often, I'm sitting down with my editor, and he'll tell me to cut out an exchange or dialogue I like because it takes away from the story, or delays the end goal. I have to sit down and see how I can edit it to get the same feeling or point across, and at other times I say, "Screw it, I'm leaving it, because I think it's funny (or romantic)."
I like slow burns, especially in romances. If you want to make a slow burn, or just enjoy writing them in general, place plot points within each scene to keep your readers wrapped. Add character development, tie things within the scenes to your plot, your character's personality, and or growth.
You mentioned liking how you become immersed in slower paced books. If that's the feeling you want then add chapter material that makes you feel engaged. I for one focus on pathos. Attract the readers emotionally, or even comedically (based on your genre).
In my opinion, you can do so much with a slow-paced book. I'm the type that never wants a book to end. So, I have nothing against them. I hope these tips help!