Pixellation has nothing to do with dish alignment. You will get the same picture quality at 50% or 90% signal strength. Only thing is if you have better signal strength, there are lesser chances of outage in bad Weather.
An engineer came to my home and told me getting 95-100% signal quality is impossible.The resistance in wires and also the length of the wire adds a factor to signal quality.Signal strength can be achieved 100% but not quality.
Now i dont know if these things are true or the engineer have feed me bullsh*t
Users if you can post some screenshots of signal quality you are getting it would be nice and would help