I sometimes use nibs on my EWG ned rigs and I've had good luck with molding them relatively flat against the bait; nibs are also great for exposed hook jigs of any kind/size. They perform well, but I don't think you'll find much difference with how often you have to apply the nibs from the spray when you're on the fish. I usually have to re-nib after each fish (maybe 2), but the nibs do last until you catch one almost always, so it's a big improvement while you're looking for the fish.
I've been messing with pro-cure and that new bait fuel on my elaztechs, and both seem to work well without damaging the baits (leaning toward bait fuel because it doesn't stink and it's easy to clean off my hands, but I do think the baits had slightly better absorption/coating with marinating in pro-cure); haven't been at it enough to really speak on performance, but I can tell that the pro-cure is sticking pretty well (not knowing if my bait has absorbed the scent is bait fuel's one downfall so far; can't tell if it soaked in if the scent doesn't have a noticeable smell ?).