"The small holes in the leaves of your pepper plants are probably from flea beetle feeding. Usually they only feed on plants for a couple of weeks before their life cycle is done. If they've been feeding for a while already, there may be no need to spray for them. And fortunately plants will recover quite readily from some feeding injury.
Peppers are more sensitive to temperature than are tomatoes. And tomatoes take off more quickly at the beginning of the season. I suspect you simply need to give the plants a bit more time to get their roots established and weather to settle into summertime conditions. The peppers likely will take off soon."