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Read this https://www.backyardchickens.com/a/hatching-eggs-101 and this https://www.backyardchickens.com/a/incubation-cheat-sheet even the parts that you think don't apply to you. This will help you understand what is going on with your eggs and what humidity has to do with hatching.

Keeping it consistently too high will not allow the air sac to grow properly and the chicks could drown when they pip internally because there is too much fluid within the egg.

There may be as much as 2 days between the first one hatching and the last one, but that's not as bad as having a week between them. You could leave them if you want to, it might just add to the stress ;) The actual amount of the water doesn't matter as much as the surface area. If you have...

Are you doing a staggered hatch? Do you have another incubator you're using as a hatcher? If not, I would personally advise against a staggered hatch at this point. It's more difficult to manage than if the chicks all hatched at the same time.

Except on lockdown. I don't open after day 18 there is research that suggests that having a brief cooldown period every day. Some incubators even have that programmed into them. Frankly I have found that it hurts nothing when I am hatching to open it up for a couple of minutes to spot...

I would either open it up and remove the water or just let it run dry. I open my bator at least once a day and it hasn't hurt my hatches.

I think that depends a little on your location and what the weather is like where you live. I personally wouldn't want to brood chicks in the fall or winter...I much prefer it in the spring that way it's warm and the chicks start laying before winter.

There are a lot of opinions about humidity during incubation. There are several threads about it on here, and if you use the search box at the top of the page, that should take you right to several of them. In the meantime, I'll give you my personal opinion. 55% is too high for incubation...