I have often come across situations like this, what I did a few times was this,
say for example you are getting 99 X on odds, then go to that transponder that is reading low for example say 77%... go to signal meter, get the customer on the phone and have them read every number as it moves up or down.
you get on the roof or whereever the dish, and move it slow, once she or he says 85 or better, stop. then go inside and check other signals, then do a verifying installation test.
if this doesnt work even with good signal, then you may have a bad LNB or bad reflector. make sure its plumbed!
i have occasionally done this when i cant pass a certain satellite on even or odd, this is pretty effective without having to be a headache to run a recievr outside with you with no tv.
ive had best of luck doing it that way when im in and out trying to lock it in, but having the customer read the exact numbers for you while youre fine tuning the dish trying to get better signal. it blows when our birddogs dont read 99 and 103s as AIM and Superbuddy does and sucks our office wont invest money in getting those satellite finders to make our job easier when it comes to 99 and 103 satellite.
its like a directv tech trying to tune in a Dish Network dish with no dish set up in ur birddog.