If you are running at stock voltage then load temp IMO is too high, it's not really dangerous but still seems high.
If you get the newest speedfan and core temp those two should give you same temp. They now read from the same sensor. Both of those will normaly give you higher temps than ASUS Pc Probe at least that is my experiance and it also makes since.
If you are getting 65c with coretemp or Speedfan then I would remount your Ninja. Make sure you get your chip and HS clean and get some ArticSilver and remount.
Ya those temps are fine and after a week or so you may see another few degrees drop after thermal paste "breaks in".
Don't know what kind of airflow you have in your case but if you can make your wires neat and get some good flow that might help as well. I've seen cpu temps drop by 5-10 after power airflow was corrected.