I'm very sorry for your losses, Brad. I've never had more than about 300 (daylily) seedlings at once, and it has hurt when I've lost some of those. I can't imagine losing 4000+ seedlings of anything, particularly when the survivors are so beautiful (one can only imagine what the lost ones looked like
), and especially right before a convention!
Like others here, I can only admire your attitude, and your talent at hybridizing, and wish you the best going forward.