First off I would just like to say congratulations. My corkbarks would not accept fruit flys, they are just too small. Pinheads may also be a little small but you can give them a shot. I believe I fed mine 2 to 3 week old crickets (around 1/4 in.). The prey item should be sort or around the length of the width of the head. I would consider removing the female from the male. My female went on a laying streak much like it sounds like yours had. I was really excited at first but in the end it was very detrimental to her health.
Good luck and if you have any more questions feel free to email me.
-Matt
madherp@hotmail.com