Have seen pros and cons to each.Do you take out the turning tray at lock down? Do you line the bottom with paper towel over the screen? Do you fill all the channels with water regardless of humidity level? Or do you go for the 60%-80% humidity? Once chicks are dry how often do you pull them out? 4 1/2 days and counting!!
Leave it in and just take the crank out to avoid pinballing and/or rolling of eggs.
Toes can get caught under edges of tray.
Have done it both ways but also use my divider to keep my crosses separate.
No paper towel, it can inhibit air circulation for humidity and if it gets wet can cause chilling. You could put PT under the bottom mesh and sticking into the reservoirs to increase humidity(due to wet surface area)....might be too much humidity tho.
Some folks use shelf liner, the foamy stuff with holes.
I don't use anything with the Incuview.
I fill as needed by hygrometer reading and air cell status..
...probably need all 3 tho and added sponges once pips happen.
Can depend on how dry your house is.
I leave chicks in bator until they start getting too rowdy, then I remove them in groups of at least 2 at a time. I try to leave at least one in bator with pipped eggs as a cheering section.