Mine are locking up great now. Keep feeding them up, and make sure your lights are on the same schedule as the sun (if you use more ambient window light).
Don't blame the boys--it's the girls who aren't putting out the correct pheromones to interest them, yet. Once they do, the boys will be interested. Keep cycling them through. When a big storm comes in, mist all the bins down, and I bet you'll see some activity starting.
There are some females who won't start breeding until the spring storms arrive, so don't give up on them.