Certainly not a seasoned expert on these stations like so many others here. I was able to get WU, PWS and WeatherLink running with only a little difficulty. Have been using WU for years but in order to get WeatherLink running I needed to take WU uploads off of the 3second rapidfire. Maybe rapidfire also can't upload with WU in rapidfire. I'm using a wireless WifiLogger for my uploads. I eventually settled on uploading WU at 6sec intervals, WeatherLink at 2 minute intervals, and PWS at 6 minute intervals. Seems to be operating just fine for me.
If you are using a wired station with a separate standalone processor for uploads then maybe it will require different intervals. Again, take all that with a grain of salt. For me the whole process seemed to be mostly thinking logically, but remember to stand on your left leg during an even calendar day.