I have to say that I think the "starvation mode" theory is a bit over used.
It does exist...absolutely. But I think it can become a bit of a crutch.
I am not saying this to be harsh, or cruel..but I don't think I would lose much on 1900 a day.
I agree, try upping your workouts, and if you still don't lose after a few weeks...then you'll know for sure that you need to lower your calories a bit.
And if you do lower them, try bumping them down just 100 or so at a time.
You WILL find that balance....you just need to tweak your plan a little bit at a time until those numbers start moving!
YOU CAN DO THIS!!!!