I shot the IC and its just a lil too tight for my liking... Most of my shots are 35 and closer. If I order a Pure Gold 670 or a Kicks 670 for my 870, wil I notice the pattern open up more? Will i notice a lot of diff between the tightness from that IC 665 to a 670 choke: Or should i go to a .675 or even a .680? I see Kicks a nd PG has a 670 choke for a 870. Which one? Should i even go more open? Opinions?