Not sure how much ported chokes help to strip wads, but wad strippers in the choke certainly seem to. Indian Creek and Sumtoy both have them, and those choke tubes seem to work very well. I agree that the longer the wad stays with the shot, the more likely the chance of it disrupting the pattern.
Federal's Flight Control Wad is designed to stay with the shot, and the majority opinion is that the concept does not work well, at least in tightly choked turkey guns. In side by side tests, Federal usually does not fair well against other brands of ammo.