Sometime ago I had an install where I had the same concern....
I wasnt the origional installer but here is what happened...
I get a service call to see if I can fix this problem as the other installer had been out several times with no luck...
Anyway, I get there and the signals were not the greatest but then they werent terrible...
As I recall I think on 119 it was just over 100 maybe 104....
The problem was line of site.... a Tree in Spring grew full and blocked.... At first I felt I might need to move the dish and realized the problem there really wasnt a better spot.....
SO I played with Signal Strength.... I brought the Signal Strength up on 119 to 121

In this case it did the job.... not to say this will fix your situation but in my case it did....
I cant remember what 110 signals were but I know they were good.
Mark