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How to set PAYLOAD STATION WEIGHT:x values

I have been struggling to set payload weights, or even get the number of payload stations, using c#. Setting fuel works fine so I at least understand the basic concept, but when I try and set payload station weight it doesnt have any effect, and when I try and get the count it get an error of UNRECOGNIZED_ID.

After setting up the DataDefinition I use the following code:

DoubleProp payload1 = new()
value = 15.25f
SimConnect.SetDataOnSimObject(DataDefinition.PayloadStation_1, SimConnect.SIMCONNECT_OBJECT_ID_USER, SIMCONNECT_DATA_SET_FLAG.DEFAULT,

I also just tried setting throttle lever position 1 which seems to be the same concept and that worked fine as well, which makes me think maybe its just not working for cargo weights.

Anyone have any ideas on this? It's driving me nuts. Thanks in advance.
I thought I would post an answer to my own question in case anyone else stumbles across this. The answer is that it does work, it just doesnt show up in the weight configuration UI in game. If you do something crazy like put 6000 pounds in the 5 cargo slot on a 172 you will see it wheelie. If you just add 100 pounds to a cargo slot you may not notice it at all. If you do a get on the total weight you will see your new weights reflected, just not in game.
Further addendum: if you query the updated weights in SimConnect you will see them. I've also found that the dotNet wrapper for the SimConnect COM call is unstable and will intermittantly return an untrappable exception on the Win32 messaging system, resulting in a CTD.