chinksi,
unless you are planning on growing seed, clip the flower stalk, it is robbing your plant of energy.
Once the stalk is clipped, your plant will probably put out even larger traps.
I believe the average for "LARGE" traps, is 2 inches, there are some 'cultivars' out there that claim to have larger traps than that.
Any how, remember, unless you are planning on growing seed then that flower stalk is really ripping your plant off, stealing energy left and right, and it DOES effect the size of your traps! clip that sucker!