Would you suggest maybe a different vessel than a capsule somehow? Perhaps pressing everything into a tablet?

Yes that is one negative of the capsules as it has trapped air in them. The best way to push them into the soil is to push them to the bottom, let them go and pull your fingers or tweezers out at an angle. This should stop them from being able to make their way up as easy. Unfortunately a pressed tab is not going to work at this time. It would quadruple manufacturing costs. I have tried finding alternatives but haven’t had any luck at this point.