I really do think that your overthinking this , if the parrots are anything to go by the lens is fine ,leave it alone do not make adjustments .. as I said earlier learn to get closer to your targets .. wherever you live in the world , there are birds / animals that you can get close to I.e ducks, gulls ,cats ,dogs etc , don’t forget your lens also has a close up mode ......
Or if you buy the dock you can make C1 for close ups and C2 for distance work . .... auto iso is dangerous as it makes you lazy in moderate light around 800iso is fine ... learn your camera ,learn your lens .. stop worrying and just enjoy it you will make mistakes the best of us do , for instance if I go out you will only see my best shot of that day , you won’t see the other 500 or so that I have deleted
It might help if I/we knew where those two shots were taken your profile says Chicago but it looks more like India/ Malaysia to me which will make more problems due to heat over haze over long distance ..
as Of January 2019 ,Panasonic G80/85 , Panasonic 12-60 , Panasonic Leica 100-400 , Nikon D300S , sigma 150-600C , Nikkor 50mm f1.4 ais.m/f ,vivitar 200mm f 3.5 m/f Large c/f tripod ,jobu gimbal plus a ton of bitzas , all items subject to change on a whim