Hi Tops,
Well done. You have certainly done some excellent research. I have been helping another person tracking down their weather station decoding on different thread and over the weekend I have tried to produce a general purpose Manchester decoder that people can use to at least get the raw binary in bytes from their weather stations or what ever. I would expect that once they have achieved that much they will then be happy go on to decipher the packet code add their own calculations etc
You can find the Debug program here:
GitHub - robwlakes/ArduinoWeatherOS: Arduino Uno, 433MhzRx and OS WMR86 Weather Station and it's called DebugManchester.ino.
It would seem that you have got some solid data of 960uS for the bitWaveform duration. So in the program I have tried to produce (above) try using sDelay=240, and and lDelay=480, and use Polarity= 1, ie negative polarity. ( the first 960approx pause is low, so the rising edge at the end of that is a 0, so lo->hi=0). I disagree with how you have interpreted the timings. I think it should decode as 1 1 1 1 1 1 1 0 1 0 1. (My commas separate the bit waveforms, and approx 960 is a full waveform).
Pin = High for 492 usec hi
Pin = Low for 476 usec lo = = 1,
Pin = High for 488 usec hi
Pin = Low for 484 usec lo ==1,
Pin = High for 484 usec hi
Pin = Low for 492 usec lo ==1,
Pin = High for 472 usec hi
Pin = Low for 488 usec lo == 1,
Pin = High for 484 usec hi
Pin = Low for 484 usec lo ==1,
Pin = High for 488 usec hi
Pin = Low for 484 usec lo ==1,
Pin = High for 476 usec hi
Pin = Low for 968 usec lo ==1, lo
Pin = High for 980 usec hi ==0, hi
Pin = Low for 960 usec lo ==1, lo
Pin = High for 1004 usec hi ==0, hi
Pin = Low for 920 usec lo ==1, lo
Hopefully this will make good use of your excellent efforts so far and give you the bytes you are looking for. I have tried to produce a recipe style program so change those 3 values in the set up, and hopefully you will see results 
There is also a short guide to how to use the program called Debug.md.
Let me know how you go...
Cheers, Rob