IMO, that magnet wheel should be left alone providing you have enough counts to accurately adjust the dish.
Coasting or improper counts are common actuator problems. A given actuator can only produce a certain amount of counts until you start having problems in other areas. Industrial actuators may have internal mechanical brakes which would provide a higher degree of accuracy. I think any actuator builder would tell you that actuators will have a certain amount of coast in them. If the counts get added into the coast, then there will be alignment problems. So if the dish is align-able with a decent degree of accuracy, then leave everything alone and enjoy it!