I'm in the process of levelling my deck. Top down diagram below, showing decking perimeter (black), beams (blue) and posts/footings (red).
Because of the irregular shape posts 1 and 3 are only 20" apart. I found in the process of levelling that beam 1-2 is nearly redundant under normal conditions. The joists above the beam can hold up beam 1-2 at post 1 if post 1 is removed without wincing.
The question is, how do I ensure that all of the posts are sharing the load evenly when I remove the temporary levelling supports, especially posts 1 and 3? It seems like it quite be easy to arrive in some position where one of these posts looks like it's doing something but actually just floating (since the deck can carry beam 1-2 without help). I will likely have to shim the posts because balancing this by cutting would need too much precision. I could shim the posts, but how do I ensure that the weight is roughly balanced as opposed to just tight enough to squeeze the shims a little?