SW
Grinder
For a short while I was starting to think my eyes were deceiving me, but I'm quite certain (including launch monitor numbers) that the Kusala launched about a degree or so lower on average.
I have not made comparisons between the 5s (5674) vs the 61s (3566) though, just the 5x (7785) vs the 61x (5689). As you can well see, that's a big jump in tip stiffness in the Kusala line from S to X.
Guess I need to get my mitts on a 4S pretty quick then.