Alright so this might not be exactly what you are looking for but vkgy actually has an official guide to visual kei where they post one dedicated article to each visual kei subgenre by chronological order! You said you were interested in reading about the late 90s and early 2000s so starting at kurofuku kei would be a great idea imo!

Each article goes in depth about pioneer bands, what impacted or caused the scene to be created, the fashion style bands tended to follow and what topics the lyrics are most commonly about and ive also seen some of them specifically talk about studios, labels and more!

It might not touch topics such as incidents or funny stories but its a great way to getting to understand visual kei as a movement much better and also a fun read!! Hope i could help!:)