Hey Rhys,
I read your earlier post about how you prepare your module trays…
I usually fill it up with compost and then water deeply (the module tray would be sitting on another flat tray to collect and save the water). The compost would then have sunk a little and then I would top up with compost again and then water again. I find it too time consuming to press down the compost for each individual cell/module.
It has worked wonderfully for me. Timewise. Just an idea 🙂
My 2 varieties of sweetcorn were all sown in root trainers (deeper module cells) and had 37/48 and 33/48 seeds germinated.