Thanks for letting me know your real world experience. I just ordered an Excess FW from some dude's shop in San Diego, but I may still try a WI if the Excess isn't noisy enough.

I did get an email from WI saying: "We had to shrink everything down to allow enough room for the teeth. We have had to engineer a channel for the chain to nestle down in to allow enough room for the chain to seat on the teeth and we use a smaller bearing with the 16t size. Unfortunately, with the adjustments we need to make with the 16t, there isn’t enough room for the 1/8” chain."