I too own a Griffin 25 but have yet to try it in single coil mode.
You say it's satisfying, I'm assuming you're referring to the amount of nicotine you're receiving, so how's the flavor?
I might give single coil a go on my next build.
What is satisfying to me is the full flavor and just the right amount of airflow. The draw is also pretty smooth and silent, I like both of these things. The airflow with the single coil plug without the air hole is similiar to my Griffin 22s, but the draw is smoother. The clouds are also huge but my single
Coil is also huge and I'm pushing 4.8 volts through it