Peter peppers are very dissapointing. They don't have a great flavor and they hardly ever look like a unit.
They are one of the few peppers on my "never grow again" list
Try serannos or fresnos, or Numex/Anaheim types for mild/medium types. For hots try yellow Scotch bonnets or basically any yellow C. chinense. Fatalii is always a good place to start for some real heat before getting into the crazy super-hots