Westphalian
I have a C8 SCT with f/6.3 Reducer and ASI294MC Pro camera on a HEQ5 Pro mount. Unguided.
I can polar align etc fine with version 2.1-10.74 of the app/firmware.
What version are you using?
What was you refractor setup? Was it working fine with the ASIAIR?
When you switched scopes did you redo everything (I.e. change focal length to 0 and let asiair work it out, check focus, physically setup everything properly, etc etc)?