I will have a similar problem with FSUIPC and axis alignment.
I have to change our flightsever now from Win8 to Win10 and latest FSUIPC and I will send the value of the FDS-A320-trimwheel to an offset to receive that value in my own trim wheel control software.
I have calibrated the axis on OS and the values will be shown in full range in Win 10 - but FSUIPC seems to cut the raw value and show me only a small part within a range of -16384 to +16384.
So I thought that I will be able to scale the axis with the RAW-button- but the RAW button is light grey and not select-able.
Any ideas would be great, because I don't want to change my controller software to read the axis direct from OS. I used this function in FSUIPC now over 5 years in my flightdeck without problems and a lot of fun.