Thoughts on optimizing gain

Tried the %strong signal query before, but when I send the command I get:
“Percentage of strong messages: 103.368”

a) how can it read higher than 100%?
b) should I be adjusting gain to less than current setting (10 for AGC)?

I am using a new ceramic filter/preamp at the antenna (100ft feedline run). Thought setting the gain to 10, AGC would pick the best gain automatically. Maybe this is not the way it works.
-G.

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