I know the feeling but try adding Floetrol as it can really help keep that wet edge when painting Floetrol | Paint Conditioner | Owatrol DirectLike current paint - dries so fast you can't paint a door without going over half dry paint
Also decent brushes, get the paint on fast with a roller or large brush and lay it off with a good lay off brush from the likes of Staalmeester
https://www.mypaintbrush.co.uk/Laying-off-brushes?mfp=manufacturers[50]