Will I get better results if I take more frames with a longer focal length?
The "perspective" mode version gives a distorted view, at least in my opinion
Thanks for the pictures... very interesting
¿Where is Bernard when you need him?
Yes, the perspective view looks distorted, but the right (waterfall) side looks more distorted.
A longer focal length should give you more detail, but I do not know how much it will affect the distortion/projection... normally, doubling the focal length makes distant hills twice as big... but, usually when you use a longer lens to get the distant hills larger, you move back so that the foreground subject still fills the view finder, but you could not do that here.
I am expecting to do some panos with 645/300mm... which might need a bigger computer than this laptop.
I hope that Bernard or someone else with experience of the different programs/projections will give you more constructive advice.