First thing; Ditch the dome. I never use domes anymore as they create as many problems(for me) as they correct. Domes really should only be used for cloning to hold in moisture, and I don't even use them for that myself. It sounds like you are cooking your seeds rather than germing them. The dome will hold in too much heat and moisture which is either baking the seeds or steaming them. Also, it may be that they are getting too much light before they germ, which will prevent germing sometimes.
Like BWD, I start with the wet paper towel method as I am able to control all of the environmental factors, and I can see when they pop. The key to the paper towel method is: total darkness, controlled moisture, and temp control. You start by getting a covered crock or roasting container that can be covered to keep out light. Then take a couple white paper towels, fold them, and place the seeds in them, and gently place them in a 1gal freezer bag. Then run some water and get it exactly 80f degrees, no warmer, no cooler. Slowly pour it onto the paper towels in the freezer bag until the towels are soaked through then fold over the bag so that the water doesn't leak out but leave it open so that air can get in. Cover the container and set in a warm place in the dark, like the upper part of the kitchen cabinets. Don't put it in the sun or on any kind of heat. In 48hrs pull them out and check to see if they are popped, most will be. I have fresh seeds pop in 24hrs.
As soon as you see that they have popped and the little root tail is coming out about 1cm, get them out of the towel and into some medium. I personally do not like the Jiffy pucks as they hold too much moisture for me and drown the seedlings. I like the Rapid rooters myself, but you can go straight into soil if you are growing in soil. I use the red plastic 8oz cups with holes burnt into the bottoms so that they can drain out excess water. You want to keep them damp, not wet or they will "damp-off" and die. I keep these in a closed location with low light and warm temps until I see the heads of the seedlings clear the surface of the soil, then I move them to the light.
I hope this helps you