Since I last updated this thread, I sold my Walther PPS M2. I bought my current carry gun, a HK P30SK V1 LEM. With 10+1 rounds of Federal 147 HST, carried in a Mitch Rosen Upper Limit leather AOWB holster, the weight is 27.1 oz.
I'll update the chart to reflect this, as well as any additional data points anyone wants to add, in the next few days.