I did an experiment with with sifted Kellog's Garden Soil (A) and sifted peat moss (B). I compared the seed sprout reaction in a mixed blend of A&B to plain sifted peat moss. I sprouted the seeds in a petri dish first and transferred them when the leaf was starting to push out from the seed. This morning when I checked the plain peat, the sprouts pushed out while the A&B blend had no response.
In conclusion, based on just one night response I will use only plain peat to sprout my tomato seeds. Also, after I fill and press my seed tray with moistened plain peat, I will make sure its 1/8 inch below the top of the tray. Then I will place a seed on top of each cell and loosely sprinkle moist plain peat on it. Then water it in with a squirt bottle, I think I will have better results this way than pushing each seed down with a chop stick. I have a tendency to push the seed down too deep.
In my observation with sprouting seeds in a petri dish, the seeds will sprout and grow in a petri dish, so it would also grow on the surface of plain peat with the point being it should not be planted too deep.