You should absolutely power up, even if just a bit.
There is definitely a problem with some users using too much bandwidth. It's likely a lot of users using too much bandwidth. Every time a user says something like "nice post" they are using bandwidth. Everything uses bandwidth. When it's super busy, it ends up depleting the pool, and all the new users have to wait, whether or not they are posting or commenting too much.
It's a matter of a ton of people using too much bandwidth when we're having an issue though, so it's not any one user.
The system, as it is, limits bandwidth based on SP, and hits new users the hardest. I think that curve is a bit too steep. It should effect older users that are commenting too much as well.
New users deserve a right to have a chance at the very least.
There is at least one good thing about this though, it's likely making new users be a lot more careful with what they post.