A Dish 500 is a dish that skews and is designed to pick up two satellites (usually 110/119) with one dish. The alt/az. given is actually a point in the sky somewhere between the actual height of either satellite.The Dish 500 for some reason was correct when it was on the SD 110/119 pair but when I went to use the extra non used 500 for the 61.5 bird that's when the elevation was incorrect,can the KU signals have a bounce effect from say nearby buildings,landscaping,roads,etc.?
To get the correct alt. number (not some artificial "mid point") from your dish pointing screen, change the box from a "Dish 500" to a "Dish 300".
That will get you the true height of the 61.5 satellite in your area.
Remember to set Skew to "zero". (i.e....NO skew...puppy sitting straight up)