Here's my advice about feed zones - get to the front when going through them. Nothing but bad things will happen. If they are on an uphill, well, there will be attacks because a hill is one of the best places to attack and how many other opportunities will there be in a race? Second, if the feed zone is on a flat area, water bottles will be dancing across the road and riders will be swerving into each to avoid them because people are trying to grab them at 30 mph. It's mass hysteria and you don't want to be at the back behind it.
Feed zones are not needed below cat 2 - the only exception would be a hot and humid day for the time of year. As a diabetic, I always bring more than I need and if the other riders don't, then they are not prepared to race. Just like I would be if I let my sugar levels drop in a race. I've heard some people say it is not sportsmanlike to attack in a feedzone - ok, I'll wait till we are 10 feet out of it and then launch. Look for it in the race, someone will and you will be ready for it.