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What accounts do you have open and actively reporting your on -time monthly payments every month?
With 2-3 revolving accounts you could/should be moving higher, but you didn't mention what you have open?
2/3 of your credit score is based upon how you manage your open and active accounts.
Hmmm, hopefully other experts will chime in, but it seems to me that you really should be in the 640+ range if not 680-720+ unless we are all missing something?
Possibly refinancing the car is hindering your score's ascension, but it could be that you just need another month or so to begin the climb from where you are.