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I have to respectfully disagree with two of your claims.................
The first is the dry incubation method although the OP may have made a slight miss calculation the dry incubation method is a highly preferred method, your claims are baseless and your claim of 80% humidity during the last 4 day's will likely kill by drowning many more chicks. 60% humidity in the first 2 weeks is ludicris. Dry incubation should be done with 30-35% relitive humidity the first 18 days, then it should be increased to no more than 50% and it will rise slightly as they begin to hatch. I don't use a styrobator to hatch in, I prefer the cabinet models and the dry method in these work great as can be attested to by only about 400,000,000,000 Gazillion people who incubate.
Next issue is your claim about the CHINESE product, with all due respect......is this a joke or a spoof........... really........ your recommending a chinese product as more reliable than an American product. Sorry but I think everybody knows Chinese made products are junk and that is an understatement.
I really don't think quoting 'ideal' humidity figures for other folk to adopt is a good idea, as what works for one person in their climate and with their bator, won't necessarily work for another. Going by chooksandeggsAus' handle it looks likt they're in Australia, and probably in an extremely dry part of it. Obviously 60% humidity throughout the first 18 days is what works for them. S/he's not talking rubbish, as the quoted figure of 14% weight loss is pretty much spot on. Al6517 is also giving broadly sensible advice which is for the most part entirely correct. (I'd like to completely disagree with the idea that 80% humidity at lockdown will drown chicks though, as I run my lockdowns that high and even higher, and I've never drowned a chick yet.)
Anyway, Chooksandeggs and Al have both got different ideal humidities, miles apart, that work well for each of them. But if they were to swap and follow each other's humidity advice they'd almost certainly both have rotten hatches!
The only figure to quote when recommending humidity figures is 11-15% weight loss. (I always aim for 13% myself.) The correct humidity is whatever one gets your eggs to that weight loss by lockdown. If it's 15% humidity, then that's the correct one for you. If it's 60% humidity, then that's the correct one for you. But neither of them would be the correct humidity for someone else, even if that other person's incubating problems seemed identical to yours.
When having troublesome humidity problems, go buy a scale. Instant solution and worry free hatches!