It's good to hear you're cultures are now working well.
I've ordered producing cultures from Josh's, paid the $39 shipping fee and got cultures with barely enough flies to even feed once and start another culture.
It sounds like you got a bum culture (and you paid for next-day shipping). I've been getting cultures for over 2 years now and a producing culture typically gives 4-5 weeks of flies. Do you keep your cultures at 76F?