Federal suggests the use of more "open" chokes when shooting their Flite Control wads. After firing close to 50 rounds of various Flite Control equipped shells (3", 3,5" with payloads of 1.75 and 2 ounces of #4 or #6 lead) I've come to the following conclusions:
#1. Not all shotguns are created equal.
#2. Some shotguns actually patterns with tighter chokes.
#3. Certain ported chokes have little, to no impact on the pattern itself.
For my particular shotgun, a Mossberg 535 Tactical Turkey with a 20" barrel. Tighter chokes seem to pattern much better. I've fired Flite Control equipped shells through .670" ported and non-ported tubes, .665" non ported, .660" non ported and a .643" ported tube. My tightest, most consistent pattern came from the ported choke with the smallest exit diameter.
Of course, YMMV.