That's cool, glad you were able to get it done! Glad they were big, more mature, so should bloom ASAP. So many of the Lycoris I dug up were tiny. Being replanted with space to expand, I'm hoping they do so quickly.
That's a good question about planting depth, I've wondered too. I'm sure mimicking what you've seen from existing, blooming bulbs is the perfect thing to do. The only trouble I've ever had from bulbs is when critters eat some.
I was planting bulbs over the weekend too, and only got about halfway through the Lycoris so far. I was so nervous they would be ruined, it got down to 14 while they were in the shed, but only a very few of them were mushy.
Took a 5-gallon bucket of them to my Mom's house, made a trench in front of a bed by her driveway, and put a triple row of them there, about 12 feet across. Here at my house, I was working on fixing the bed around the fence that got driven over by the roofing truck. I made it about half a foot wider, with a heavy row of clumps (3-5 bulbs each) at the front edge. Then I added another row across the rest of the bed that wasn't disturbed. In a few years, it should be epic!
