Hi Sam,
No, a hook gape the same size as the jig will jam, I go to a bigger gape hook, but If I dont have anything wide enough, Ill go to a smaller hook.
Some guys like the rubber band, some dont. I dont really see the need for it, and I reckon the flailing assist adds to the attraction. I have fished side by side with guys who use the rubber band and havnt seen any difference in hookups, lost fish, or anything else.
Cheers
Ben