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I don't know if there are necessarily tiers, but I do know generally you should get all of your individual utilizations below 10% and have at least half of your CCs report $0.
For myself, I noticed that for every 10% of overall utilization I lower, my FICO score goes up 10 points. So, if I lower util from 80% to 0%, I'll generally expect 80 points. All this assumes your mix of credit is OK and that you have no COs impacting your util.