Yup. Biggest deal is the fan CFM. Absolute minimum I would say is about 3,500 cfm. With only 2,000 cfm you're not moving anywhere near enough air.
Next is a thermostat. You absolutely need one. High flow, standard, whatever. The system was designed for a restriction there, honestly I don't even think high flow 'stats are necessary for most applications if everything else in the system is matched up to work together.
The radiator is fine, as evidenced by the car running at 180° when you're cruising at speed. It's the fans and lack of a thermostat that's hurting you most.
Is this your radiator?
Summit Racing® Universal Fit Aluminum Radiators SUM-381328
If it is, then the 22.5" core would lend itself to using a Ford Taurus or Chevy HHR fan. Both are capable of moving enough CFM. The HHR fan is from a 2007? HHR, I think they're a little thinner than the Taurus fans. If you do a search on here for HHR there's a few threads on the installs.
