In addition, the old V2 stalls are air cooled. So, in addition to having to share the 150kW feed with the paired stall, Tesla drops the amperage when the weather is hot. Some of us carry a rag or other water absorbent material and saturate it with cold water to wrap around the handle. We notice slight increases in kW using this technique. But you need to refresh this method every so often.
We believe that Tesla changed its pairing method about two years ago. Under the original method, the first to plug in at a paired stall received whatever his maximum could be considering SOC and battery temperature. The second to plug in would receive what was left over. So, if you plugged in and were receiving 100kW, when I plugged in at the paired stall I would receive ~48kW. As your rate tapered down, mine would increase.
The new method is to split the charge equally, as close to 75-75 as possible, regardless of plugging in time. So it is possible that you would have received ~75kW but because of the hot weather, the max rate pushed to your car was 40ish.