x1000 is a very buggy gamemode. TF2 has a really low entity limit, when paired with x1000, makes it difficult for us to keep the weapons as close to x1000 statstics as possible without crashing the server.
Many spammable weapons that have a lot of projectiles are difficult to nerf without making them x100 weapons.
If you don't understand what I mean with the entity limit, I recommend this video: