By the way I would still not generally recommend setting the fan above 80% due to the design flaw that makes the higher pressure 38mm fans blow so hard that the low pressure fan 25mm is spinning but air is moving backwards through it.
Does that apply on the batch #3 too ? Not had the case off mine but it appears from the outside to only have those 2 high pressure fans, changed it anyway.
I don't know to be honest. Is there no 25mm thick fan in the batch 3s? If not then it doesn't matter. Generally I'd suggest leaving the fan on the auto settings since I spent a lot of time making them work for optimal temperature/fanspeed/energy consumption.