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Yes, letting them rest as you've described then candling to look for cracks and/or loose air cells. Washing or not can be a toss up, some do it, some don't. Sanitizing any eggs that may have/had poop on them can avoid the stinker situation you had.

Here's a good guide for assisted hatching: https://www.backyardchickens.com/articles/guide-to-assisted-hatching-for-all-poultry.72886/ Heating pad would work well. When I assist a hatch I use a swing arm utility lamp with an incandescent bulb, to be able to see and to provide an 'overhead'...

Bummer! Were they shipped...if so, did you do any prep? So you are on day 22? Is your thermometer tested against a known accurate one? https://www.backyardchickens.com/articles/testing-calibrating-incubator-thermometers-and-hygrometers.73634/

Any egg that is oozing and/or smells bad should be removed immediately. Have you been candling throughout incubation.... ...to check for development and or those stinkers? This one may have internally pipped, they won't rock constantly... ....should externally pipped with 12-24 hours. Eggs can...