I would visit all the jobs as trim was being delivered - within a day or two. I'd mention to the carpenters that they were "mitering at their own risk" since no matter who gets blamed, they would be doing the reworks and fighting to get paid. This was after the paper explanation of not putting finished wood products on site before the site had dried out sufficiently.
I would use a sling hygrometer and a moisture meter and record info as I walked around the job.
This would send the carpenters to the builder or project manager. They would mention the hardwood guys - checking subfloors for moisture contented waiting until the real HVAC is on and the place drops below 40% RH. They would mention me and my 'instruments' as one put it.
If the carpenters did not do my work for me or were somehow ignored, I would then send my temp and RH data to the builder, framed in a simple scientific format, and could easily show that they were inviting problems. This always did the trick. I did have angry builders make calls and get all upset because of this. I would point out this was not a subjective call on my part (made to cause him problems), but an objective call based upon fact.
I became 'the expert' on the topic and was asked about flooring, tile and other things I knew nothing about. I did keep on hand a couple of mitered joints that had each failed - one to shrinkage, one to expansion - as a pass around that easily explained what I had discovered. This was considered the final step - tell them what you are going to tell them, tell them, then tell them what you told them.
No one had ever had anyone pay this much attention to their projects, so they became loyal customers. And the miters were tight, so the carpenters and everyone was happy.
We have three masters to serve in this work: the Owner, the Builder, the Carpenter. Each has their own goals and demands. Pleasing all 3 makes for a very successful project.