My experience yesterday with our AWD Model 3 was roughly similar. The car started preconditioning the battery as we were going through Spokane. We hit the charger with SOC at 24%. The TeslaMate data shows the power ramped up to 173kW at 26% SOC, then started to taper off. 150 kW at 30%, 121 kW at 40%, 105 kW at 50% and 65 kW at 60%. While I did expect a bit higher power, I won't complain, as the car had enough charge to make it home before we had finished our sub at Subway.
And, as we live in Moses Lake, a day trip to Spokane has always required getting a bit of a charge somewhere along the way. The recent reliability issues at Ritzville have turned these trips into a much more chancy endeavor than I prefer. I am over the moon to finally have this Supercharger open.