What is the basic rate limit for relays? Will they block approximately 30 MB per user broadcasted in 5 seconds? We've tried various approaches, and Vitor even rewrote it, but it still gets blocked. 

You can even see how many events you got from a particular relay and how many events your able to broadcast. Even though you don't have any events in that relay they will just block it after certain limit.

It may also be related to a timestamp issue. Because it price to broadcast all the events