Ventilation needs to be constant and stable, with the option of additional ventilation at hatch, since then they begin to breathe.
I would read the entire thread on ventilation, put upper and lower holes in your homemade bator and stabilize it then.
A roving wiggler temp of 99-101, while not optimal will hatch eggs. Water jugs or jars should help that - so should resetting your temps with constant air flow/fan.
If you did not calibrate/test your hygrometer - do so now. TOO much humidity kills as easily, even more easily, than too low. Know how high or low your hygrometer is reading.
Homemade bators can work very very well. Mine needs no heat sink and remains stable. It is just a lot easier to tinker and stabilize WITHOUT eggs in there to worry about.
My redwood antique one also holds temps well. So does a Dickey or a Sportsman, or the super duper Brinseas but wow costly.
I was going to buy a Dickey. BUT I learned to hatch in what I had First. Because successful hatching is about understanding the process for me.
Sure plug-and-play can work but if something goes wrong those folks don't know what to do to fix it. That's not my thing.
I went in to this to learn how to hatch and why it works as well as to hatch chicks. I saved a TON of money using a homemade, then found the redwood and don't have to save up for a Dickey.
Hatching is an art and figuring it out, a project. But one well worth learning.