at the club we use fastrack at the shows and we have no feeders hooked up because we make sure the track is tight together when we screw it down.
Which is sufficient. Because it is moved, and checked more often. More wires = longer tear downs. Cheaper without the feeds. Etc, etc. But copper buses and feeds move power more efficiently. And you would need two problems at once on the center rail (more on the outsides) and both between 2 feeds before even being noticed. It also narrows all weak links to one area quickly. I check out connections by default. Having done electronic servicing its natural. Your suggestions on improving them is great. But for more permanent, or large use, I'd say its smarter to stay on the big bus tip.