Was there ever a rule in place that said NICU nurses had to float there? At my current hospital NICU nurses will float there but they only take care of the babies which isn't too bad. If you are Union I would talk to your rep!
In my PICU that patient would be a 2:1 unless they were on pressors or about to go on CRRT or ECMO. I hate how they staff here though. A new DKA patient can be so time consuming!
One thing I've learned from being nurse is sign on bonuses are not always good. It usually means the hospital is hurting for staff. If pediatrics is your dream I'd take the lower pay and get 1-2 years experience there then travel or go elsewhere for ...
I have felt the same way when doing research. I usually need to step away from it for a bit to help me remember why I'm wanting to research this. Be kind to yourself you are doing a great job!