Hi Alun,
That is a nice set of results showing different H-alpha profiles.
While Vega has a very simple spectrum, I do like it as it is such a great illustration of the luminosity class, which in the case of Vega is a V for dwarf. As the star has a smaller radius, so the surface pressure is higher, leading to pressure broadening of the spectral lines.
Once you get used to doing darks and flats then you will find them a doddle. Particularly with the Lhires III inbuilt flat lamp.
Cheers,
Andy