Cabinet incubators are very different from foam ones.
Since two got stuck, I would suspect either temperatures not being quite right of other stress to the embryo. Shipping eggs and using one of the bad methods here or having a pallet dropped on the box will cause stress that will stick a chick. I have said it before but it bares repeating--stuck chicks is caused by not absorbing the yolk. Humidity can be a cause but is not the most common cause.
With your new Dickey, I would keep it at 40% during incubation and raise the humidity when you move the eggs down to the hatcher part to 65%. After the hatch is over, lower it back to 40% until the next tray hatches.
You have the combo one with two incubator trays and two hatching trays? With that you can hatch all the time with no problems.