Don't have a greenhouse I'm afraid.Mate.
Get a length of guttering. Fill with compost. Put seeds in. Water every day. When they come through, slide whole thing out into shallow trench in the bed. Start them in greenhouse first, then hsrden off before planting out. Done it for 10 years and works every time.
Never ever soaked them.
But I did make a small raised bed for them and tried 2 goes so far, and didn't get so much as a single leaf.
I think I'll have to try small pots on a windowsill - might as well, since nowt else has worked.