Things have gotten so bad with load quality and the preloaders simply don’t care because they want to go home. Supervisors do nothing to enforce load quality, so our trucks look like they were loaded via tornado. I spend over a half hour on the clock fixing the load on road after doing a straight air run because the preload cannot even get us out of the building on time and our start time is now one half hour later than it was 4 years ago. That means tack on an addition 15 min before I can actually leave the building. The local is well aware of the problems, but nothing gets fixed. Things here have gotten really bad over the last 4 years. The few minutes of work I do before start time is enough to get my hand truck in unobstructed.
When you show up, ask to change your start time so you can work legally and contractually. If preloaders don't want the time, you might as well take it. If you can't start getting paid early, take the time after pcm to finish loading/fixing your load. If this will cause you to have late air, tell your supervisor before you leave.
If you are told to stop doing that, then at least locate all your air and put it where you can get to it quickly. Once your air is done, and maybe you get a bulk stop off, pull over somewhere and fix the first few shelves. Then again, sometime after your full lunch break, fix the rest and be sure to page in any misloads.
This will probably help your over/under, but that's management's problem anyway. If they threaten discipline for numbers, remind them of article 37, and if they continue with the threats or other forms of harassment, then you file a grievance. You don't file a grievance because your center manager asked you if a piss bottle was yours, and then accepted your answer.