It's strange , I have 11100 coins and open for stake everyday . I have opent for several month and POS nothing.
your coin is too low right now if you need POS maybe 100k coin
I have just under 36,000 TZC and I have been averaging 800 - 1000 coins every 30 days. Lots of inputs (over 375) and over 500,000 coin days.