I would change the approach a bit. I'd want to gear out less champs in general right now, focus on getting your Galek (who I think will still be your best farmer) to 60 first and put him in your best Lifesteal. Then focus on farming 12-3 Brutal (stay away from Nightmare campaign)
Then I think I'd 60 Rector after that.
In general all of the champs are pretty slow because I think we are trying to gear too many champions too early. It does look like you might have some reasonable artifacts but we need to condense it onto our farming champion first and foremost.