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Quote from Sydaxis»

If you're just hunting DB's then you should likely clear to the end of the rift regardless as it gives greater chance to run into gob packs as well.

I'm not sure that this is true? The chance of a goblin spawning is based on RnG, and does not increase if you are near the start, or end of a rift. You are just as likely to have it spawn at the start of your next rift...