>>1453601No problem, one thing you might want to check on/off depending on how you like it is "Integer Scaling" which can be found in "Settings" -> "Video" -> "Scaling" -> "Integer Scale". I usually have it off but sometimes turning it on can fix shaders looking slightly "off" I guess.
Also if you want more shaders you can download new ones from other websites, just pop them in your shaders folder and retroarch should be able to use them, although even I get errors for a lot of them since they require different backends but just search and find which ones you might like to use. You can usually find them by searching "retroarch shader pack download" and either finding them off reddit or the libretro forums.
Glad I helped, and good taste on NHK.