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Yeah, while this is not fixed Hive is getting a little bit more centralized since only the ones at the very top are being able to keep producing blocks

That's not actually correct. The bug is just causing non-top 20 witnesses to frequently be scheduled more than once after they get scheduled. So the same overall rewards are being handed out to non-top 20, just not as uniformly at a particular point in time. The issue has been discussed and analyzed in more depth in the witnesses channel on mattermost, probably you should join there for more up-to-date info as we work on and test the fix.

Where do I join it? I would like to join to follow more closely

It's run by @guiltyparties so contact him.