At 1400 calories, I'm mildly hungry when I go to bed. But I also see results pretty quickly, so I just deal with it. So far, it hasn't affected my strength gains. I'm doing well with STS, so perhaps 1400 is my current "magic number."
You'll have to try 1400 - 1500 for about a week and see how you do. I know there are those who feel you should
never be hungry. I don't know...it doesn't appear to hurt me. Eating more (1600+) definitely hurts me in the fat loss department, but being hungry at times...nah.
I'd give it a week though. Unless you're so famished and weak that you're dragging yourself through your day. That's not good. Then I'd up the calories by 100 and see what happens.