Enjoy the the move. We moved from California (Bay Area) in late 2013. We did not have any issues changing our residency and had no follow-on tax issues with CA. The COL change was not as much as expected other than the Income Tax situation. Insurances (Heath, Car, Home) are more expensive in FL. Our Utilities are definitely higher in FL, but that is because we had no need for Air Conditioning in CA. Property tax is higher in Florida, but it was offset by a less expensive home.
Our CA house sold immediately also, but If we had a crystal ball, we would have held on to it and sold it this year. Florida Winter is the best but Summer takes an adjustment. Air Con is a great invention, and the pool is used frequently to quickly cool off after outdoor activity. At the end of the day, retirement is a bigger transition than a relocation. No regrets on the move.