For what its worth, I'm a pool tech in NY, and the majority of my pools run at 40% or lower. If a pool isn't maintaining the FC levels I expect at 40% it tells me to start looking for a problem (i.e. CYA too low, Salt too low, scale on cell, etc).
You are a bit farther south, so it wouldn't be unreasonable to run at a higher %, but 80% sounds a bit high.
As Jason suggested, raise up the FC and see what happens. I might go a step farther and suggest raising it up to Shock levels. If you are on the verge of an algae bloom, you will want to head it off before it takes off.