Fan surveys are not reliable. Looking at you attendance you are close to selling out your home games. Which should really be the main point here. Having half a star or 5 on one part of a fan survey is not a big deal. Fan survey is "supposedly" linked to game attendance. Many factors influence game attendance too, like winning streak, rival and televised games not to mention cup/tournament games and your performance last season.
An exceptional or higher pr manager would give you a more accurate fan survey and better merchandise income. But do you need one in division 4? Absolutely not. I only have a basic pr manager and I am in division 1. Focus on the economy page and arena attendance. Winning takes care of everything.