What are you all sowing your seed in
I have found that straight mp compost should be renamed mk compost (multi kill) as you name it and it is not suitable to grow it. I find it much too stodgy and moisture retentive for most seed. I had a complete failure of 100% from a batch of home grown Ricinus seed in 2009 and I'm sure it was the compost was too wet.
Generically, most seed needs equal parts air and water to germinate, so a stodgy compost does not have enough air to give a high germination percentage.
Also high concentrations of feed can inhibit germination, so moss peat is better than mp, but you would have to transplant to give nutrients.
As I have said I will sow my this week, but will be trying a mixture of about 50/50 mp/perlite in small cells to be potted on soon after germination. I might also try the baggy method which allows tumbling to get air in.