Last year I bought 5 CR seeds and none sprouted. I was using the "standard" method of planting the seeds about 1/4 to 1/2 inch under the soil and then watering as the soil lost moisture. My jalapenos, habaneros, bells and everything did great but none of my reapers sprouted.
This year I decided I would try again, put more effort into it and also try some chocolate moruga scorpions. I had 7 seeds of both. I put 2 of each in some soil in solo cups and watered. I have tomatoes, habanada, bells, jalapenos all doing well, but none of the CR or Scorpions spouted. So I decided to try the paper towel method, which is new to me. I put 4 of each in two separate paper towels. After a week 3 CR and all 4 Scorps are spouting! I transplanted them to soil. Some were loose and I took the seeds gently and planted them roots down, while some others had grown through the paper towel, so I cut the towel around the root and planted root down. I also planted some Habanas in paper towel which all sprouted. A week or so later, the Habanada are doing great, have second leaves and are 2 inches tall. All of the CR died. Two of the Scorpions died and the other two seem stunted, they still only have the two original leaves and are not getting any bigger. They are under a grow light, using the same soils, water, etc as the other peppers which seem to be doing fine. So I'm obviously missing something with these super hots.
Now to be honest, I am a bit of a lazy grower, I've never measure PH, compared soil, check temperature and humidity. I've always successfully had enough sprouts grow and product to make me happy. So maybe I need to work a bit harder of these or am I missing something?