I had 2 banana pepper plants that never reached that height last year, and produced a TON of peppers. I never pruned either of them. Depending on where you are, I'm in Michigan, I would NEVER do anything to inhibit pepper growth. I don't know if I'm right.. but I figure I'm way north of their natural growing area, I'm going to let them do what they do and not get in their way.
Either way, I'd say let them flower and enjoy! It sounds like you have nice, big, healthy plants there! And get ready to preserve or cook! Those little babies will kick the peppers out! I had a hard time keeping up with my smaller plants last year. : )
"The earth laughs in flowers."
-Ralph Waldo Emerson