I would use the 24-8-16 at 1/4 strength. Start light.

Peppers don't need much, especially when they're seedlings.

Josh

Check this article out. It will helped me with my garden,

Here is a link that might be useful: gardenprimer

the third one in your list is most likely an organic fertilizer, and the #'s are not comparable to the first two, which are assuredly non-organic ferts. Put another way, the "4" in 4-6-3 is not going to be 6x as weak as the "24" in 24-8-16. Nonorganic ferts usually have #'s like 15-30-15 and organics can be as low as 1-0-0. It's more useful, I think, to focus on the proportions between the 3 #'s than to try to compare across organic and inorganic products. Early in the growing cycle, the first # could be higher than or equal to the other 2 #'s; later on (prior to fruit set) it's critical to get that first # down and the other 2 up or you will end up with beautiful huge plants that have little fruit.

But overall, be conservative with fertilizer and peppers no matter which you choose. They don't need much fert; you are better off giving them less and making it up later if they don't look as strong as you wish.

I dont know if this will help but i am using worm casting tea for my seedlings and other young plants. Its mild enough to not burn and also gives the little boost my plants need right now. I dont plan on using worm casting for mature pepper plants.
"B"

I use Miracle gro 15-30-15 at 1/2 strength every 2 weeks as a lot of people I know use and had great results.