Finally found a solution to making the smaller 6S wear more comfortably. I tried wearing a 5S+ when it first came out, but it never sat well on my small wrist. I ended up with a regular 5+. The larger size and thicker band wore better even though it was heavier. I then had a 945 which felt like nothing on the wrist in comparison, but I’m not a fan of large watch faces (again, small wrists).
I decided to give the Fenix S model another shot with the 6S since they addressed some of the design issues with the 5 (lug size and weight). While the 6S is more comfortable than the 5, it still couldn’t beat the 945 for all day wearability.
I suspected the strap could be part of the issue. The 945 band is wider (22 vs 20mm) and longer. This seems to counter balance the weight of the watch on the top of the wrist, helping it sit flatter without having to wrench it down too tight. My 945 band is also well worn in. So my ideal watch would be the 6S (I prefer the build quality and updates over the 945) with a 945/935 strap.
Turns out this combination can work! The 945 band is supple enough that it can be squeezed into the 20mm lugs of the 6S. It doesn’t look too bad, either. And, yes, it is squishy enough that the spring bars in the new 6 can still be removed after installing. Further, the 945 strap lacks the QuickFit mechanism which I find to be too stiff at the critical point where the strap meets the wrist.
TL;DR A Forerunner 945 strap on a fenix 6S is super comfortable.
Hope this helps anyone looking for a better band. I tried MANY and this one’s the bee’s knees (for me).