Trouble with Pelleted Seeds

[Greatgardens]

I've noticed that when seeds are planted the same year as packaged, that pelleted seeds germinate essentially as well as uncoated seeds. But by the 2nd year they start having a difficult time getting through the pellets. I'm referring to lettuce and carrot seeds. Anyone else notice this? This year Im going to try nicking the pellets and see if that helps. I also might try soaking them in water overnight before planting. Any other ideas?
-GG