I agree. Try peaking it with the 5LNB. They do peak better.
Just to make sure your dithering correctly:
Loosen Azimuth bolts.
2 turns counterclockwise - (write down signal reading)
Turn Clockwise until birdog has same reading.(write down number of times you turned clockwise to get to this number)
Divide number of turns times 2 (if it's 4.6x's make sure you turn back countclockwise 2.3x's EXACTLY..(NOT 2.1 OR 2.4.)
***MAKE SURE YOU FOLLOW THE SAME PROCEDURE WITH THE ELEVATION****(Loose the outer Elevation bolts)
A lot of techs mess up because they do the Azimuth Only and not the Elevation.
Works Every time...Flawlessly....
Hope this helps..Goodluck