I "deep clean" a bore and then, for the most part, only use a dry bronze/brass brush between shots, if the patterns start to degrade. That can really vary from gun to gun however. Some of my guns just keep right on patterning, shot after shot and others want to be brushed after every shot.
You may find that the Flitecontrol Wad leaves a good bit of plastic in the choke tube. That's not uncommon. You may be able to regain the patterns just by cleaning the choke with a good brush to remove the plastic build-up from it.
Thanks,
Clark