Field Submission rules - hidden field

Hey! 

I have created a hidden field to be able to handle that new contacts that come into the system get certain types of values.

However, I only want it to be new contacts that come in via forms that get these values ​​and have therefore not set the condition Overwrite data. 

After a contact has filled in the form, I want the contacts that get a certain value to go further into a nurture. If the value corresponds to what I have put on my hidden field, I want them to move on to a nurture.

Can I in any way distinguish between the contacts that are new and should have the hidden value and the contacts that already exist and have a different value? And get the right contacts in to the nurture that i want? 

I have tried to set it up as the picture shows below, but without the result I want.