OK well the first thing is first, if you don't have another incubator on hand and you don't want to get one, you aren't going to be able to save them all.. Chances would be better if you had a second one in this situation.
Here's why:
Three days before there due date you want to lock them down, temp stays the same and humidity goes up to about 65.
The problem you have right now, is some should have been locked down and some aren't ready yet. So if you Lockdown those that are suppose to be locked down, your other ones will get to much water and become STICKY. When they are sticky it's hard for them to absorb that yolk and finish the process.
Now your temp should be at 101 to 103 with a STILL AIR Incubator, A still air means NO fans are in it.
If you have a Fan then your incubator temp should be around 99 to 100.
So what you have to do is figure out each ones due date and count back Three days all these eggs should be in Lockdown. Right now I would sit down and put the lockdown eggs on one side and the others on the other side, Tell me which side is more, That's the side we are going to work with. Praying the others will be OK in the process but I rather you get more babies then less.... That is if you do not want to get another incubator.
If you get another incubator you just made life a little easier because you can take your lockdown eggs on the one side and as soon as your settings are perfect on the new incubator. BOOOM put them in...
How many eggs total are we talking???