As it turns out, I may have been misleading about the size of 3 year olds compared to full size Music... After pulling the main crop of porcelains it's obviously not even close. I do think I did better with previous 3 yr old bulbs, but not this time. Spacing does seem to make a big difference, as the same garlics were smaller even with slightly tighter spacing in the second main bed. YMMV!
