It is currently hard to tell how high of some of your bonuses on a planet are. If they come from planetary improvements, you can look at the improvements, and calculate them that way. However, if the bonus is from an event, then you may not be able to look them up at all. Bonuses to planetary defense and tourism, for example, have that issue.
Planets in GalCiv 2 had a summary screen which showed you the total bonuses you receive. Adding something like this to the planet screen in GalCiv 3 would be quite helpful, in my opinion.