Right now you can run ultimate for tier 5 loot at A or even A+ at a delta of 0 or even +10-20 if you are smart with the customise option for the modifiers.
So how is forcing a -30 delta at all times supposed to be making it easier?
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No reason to power past 470 with the deltas. Now the power system is completely useless. Customs games shouldn't have deltas, okay with matchmaking though.