I don't know if this will help, but here's what I do, somewhat successfully.
Dig the bulbs before first frost and leave the foliage on.
Allow them to dry out in a moisture free area at about 70 degrees. Leave the foliage alone.
This will take time, and I can't tell you how long, but I usually let them dry until the foliage is totally crispy.
Once dry, cut off the dead foliage and store the bulbs in peat moss, very dry storage and not packed down and not touching each other.
Store in a place that can be kept at about 55 - 60 degrees. They don't do well at all if they get colder.
I've found that storing in a basket works best, something about keeping them dry, I think, maybe air circulation.
I believe the key to the whole thing is in the dryness and in the temps. They don't need moisture at all, it will cause rot. And they need to stay fairly warm, but not very warm.
I rarely ever lose bulbs over winter, but I swear by peat moss.
