I'll be watching this also. Very nice can't wait to see hammer pop those ogm x glue.
I (think) that the seed shells have a fiber that needs to dry out to become thinner on fresh seeds sometimes if not the fiber has to much elastic to it not letting shells open once tails pop. Ive had this happen before with fresh seeds and ive had seeds pop right off the plant to, so i guess its strain related. I use to use the paper towel method but over the last 5 or so years ive been just putting them in water until they pop a good tail then sticking directly in soil. If they dont pop a tail in water i still last resort stick them directly in soil, sometimes they still pop sometimes they dont. Recently i tried to pop some G13diesel(heads) x Vortex that i made years ago and they had issues so i just stuck them directly in soil with no soak and they eventually popped.
Things look like there moving along... Hope these turn out great for ya