Not sure that you can fix it, but I found this thread when I was interested in growing in containers.

http://forums2.gardenweb.com/forums/load/contain/msg0418372315718.html?141

It's a bit of a long read, but the basics of making an excellent fast draining container mix is easy to find if you scroll down a bit. The name alone, "Water Movement..... should be of interest.

You have to moisten the potting mix before filling the containers. Dump some in a bucket (or something similar), sprinkle it with water, mix, and repeat if necessary. You don't want it wet but you do want it moist.

Rodney

I place my pots in a tub of water and let the pots soak up the water from the bottom (some even kind of float) for maybe an hour. I then put the pots on racks to allow the water to drain. This worked for me and there is less chance of the seedling dying from damp off disease.

I agree with theforgottenone: they key is to fully wet your soil mix before putting it in the pot. If the mix contains a lot of peat (which most store bought mixes do), you can put it in a large container and pour very hot water over it. Allow it to cool, stir it up well and then drain away the excess water before filling your seed pots.

Starting from seed is more difficult than many people imagine. Seeds need just the right amount of light, moisture, warmth and humidity, as well as suitable growing media in a not too deep container. There's a short overview of how to do it at the link below from the Growing from Seed Forum FAQ.

Here is a link that might be useful: How to get started growing from seed

I use coir that comes in blocks and expands. I expanded one of those and left it on the bench and it stayed moist for ages. I used store bought seedling mix once and mistakenly presmoistened it a few days before (it still looked moist), then when I immersed the seed tray the soil just floated out because the bottom was hydrophobic. Such a pain. I have no idea what's in those seedling mixes but I don't find them very useful.