I remade the pano using the cylindrical projection mode, instead of perspective projection mode. Makes a big difference (eliminates the distortions)
the cloud formations in right of picture are natural and not a result of a stitching problem (my initial thought)

QUOTE=bestdog;163069]Thanks for feedback Prospero,
I'll work on reducing the distortion on sides. Besides widening the scope of what is photographed, then cropping, any tips?
With the first pano I realised after stitching it together that I should have taken the images as portrait and included more of the foreground: that striking mustard roof.[/QUOTE]