Dish moving problems in receivers do not happen very often or not like they did a few years ago.

Calibrating at 72W when you are actually 74W allows for 2 degrees of error immediately. These degrees of error my not be noticed on the satellites that are close to center, but will become much more noticeable as you move farther away from center. If you are out 1-2 degrees at center, then you will be out several degrees when you are at 60 degrees from center.

Plot the satellites you have or can get on a graph. It is very common for one side of the arc to be low, and the other side to be high. Try to check satellites out to 50-60 degrees each side of center, and make a note on what has to be done in order to get a signal.
If the dish has to stop short of a satellite in order to receive it, then the dish is too low.
If the dish has to go past the satellite in order to receive it, then the dish is too high.