I'd second Premier's Pro-mix. It is fantastic stuff. In 2007, I potted up into Scott's Premium potting soil and had disastrous results. You can see the pictures of the difference between seedlings potted in the two potting mixes if you follow the link below. My post is about half way down Bellatrix Here is a link that might be useful: Gardening Mistakes - potting soil

Let me start out by saying I'm no expert, but have been gardening, lets say 60+ years. I love peat pots because of easy plant watering and easy planting. Yes, I use all kinds of little and big solid containers but peat pots let me keep using two words, easy & reliable. This is my approach. Never buy a jiffy peat pot because they are too thick, too short and have no holes for water absorption. There are peat pots out there ½ the thickness of jiffies, aprox an inch deeper and most important they have at least 4 slits around the bottom that go up about ¾ inch. This all leads to easy watering by putting 18 pots in those black plant trays you see everywhere. Put the tray where you want it, put an inch or plus of water in the tray, come back next day to see if top is damp, if not, put more water in tray. Just keep top damp about 50% of the time. One more little item-----is the tray & water level? If not get that level out and make it so. This is nearly always necessary in my state of TN. When planting take your finger and with a little thump the wet bottom will fall off without disturbing the root system..That's it, nothing fancy.

Since no one else has commented... The Lee Valley seed starting kit that I have has an open hole at the bottom where the soiless mix contacts the mat. I think that cell packs would not allow for enough soil contact unless the bottom is cut open.

You might try putting them under water to break the soil off and seperate the roots(underwater)as well,seedling roots are very delicate and if you break them(to much)it may kill the palm.Good luck-