Budderton also found slow veg. growth in his LA Affie mothered plants. I don’t recall the exact post.
(I’ve watched a lot of war movies and imo, it looks like Aghanistan often has carbon-poor soil. Much like a desert up in the volcanic mountains.)
Budderton’s LA Affie x Afghan HP cross is fairly close genetically to Dank Sinatra. Good info in his topic on on-going experimenting with pure Afghan plants: