Love this post.
Consistency is the white whale of umpiring. It's great in theory but the reality is it is exceptionally hard to achieve.
Umpires aren't robots, they are impacted by nerves, tension, fatigue, pressure and lapses in concentration like anyone else is. The you have factors like what they can and can't see at different times during the game depending on the position of the ball and other players. Not to mention that unless you see every decision through the lens of the umpire's vision you cannot determine their consistency anyway.
The nature of the game and the rules require a lot of interpretation and determination of time, distance and action, in a 360 degree game, played at high speed and intensity.
People make up all sorts of ridiculous nonsense about why I try and be balanced about umpiring, the truth is I recognise that it is by far the hardest game in the world to adjudicate.
Players can't be consistent with set shots from 30 metres out from goal and yet we expect umpires to perform much more difficult tasks at a more accurate level?
As Roar says the only thing to do is accept there will be inconsistency and take responsibility for that which you can control, your own actions.