Later today - I will try the same ride again - but this time with the Rouvy iPad app. It's sufficiently different to the Mac beta ....
Also - I do not think (could not easily see) where calibration is present in the Mac app. So there may be some relief there ...

I do not mind having to work harder than I expect BUT when the road ahead seems to have ~ 2% grade and I'm struggling - it's a bit discouraging :-(

Will report back on anything that I find.