This is a very important step a lot of people miss. Filling the well when you have good visibility (turner and base plate removed) the first few times. So you can learn exactly how much water takes per well. Also how it looks deceptively "full" based on the outside well water level when it's actually not even close.I guess I’ll add my 2 cents. For me, achieving 45-50% came from opening the vent all the way. Leave B plug in. Then fill A port. When I say fill “A” I mean before setting eggs, pull out all the pieces to expose the “A” and “B” reservoirs. Fill the entire “A” channel until all of the surface is covered with water. At lockdown, do the same with “B” and you should get a constant 70%. Well, I did at least.