@SunnyBro
The best way to handle PPH metrics is to not worry about them. That's your supervisor's job.
Rest assured, my PPH was never actually anywhere close to 9000. I put more effort into loading my trucks properly. Preload wants to cut hours despite increased volume? Oh well, I'm not gonna kill myself to make their plan work and neither should you (it's kind of ironic how that mentality of mine completely flipped when I became a driver, but that changed abruptly several weeks ago.) Work safely and with a sense of urgency, but they can't hold you to a production standard without giving you ammunition to use against them.
The cool thing about adopting this mentality? If you actually care about improving your job quality and load quality, speed will come with time. The trick is repeating proper loading methods over and over again until they become second-nature to you. Eventually you'll get to the point where you don't even have to think about what you're doing, you just do it while you keep your mind occupied with something else.
Since you're still trying to earn a permanent position, however, I've got a bit more advice for you. Screw everything I just said and hustle, hustle, hustle. PPH still doesn't matter, but you're going to want to keep your pull clean as a whistle and help others around you when you've got the opportunity. Depending on what kind of set-up your building runs (conveyor belts or otherwise) and where your pull is located, that's all easier said than done. I've only got experience with belts, and all I can tell you is that the closer to the bottom of the belt you are, the easier your job is going to be. If you're at the top of the belt, you want to focus on missing as few packages and getting your scan percentage as high as possible. If you're at the bottom, those two things are pretty much taken care of for you by the nature of your pull, so you want to focus on clearing the belt/rollers and loading as accurately as possible.
If you're still hung up on PPH, shoot for the god.damn moon. 300 or higher. Once you pass your probationary period, slow the hell down and start to talk to your drivers. Get a feel for if they even care how you load, and then adjust accordingly.
**ETA: Also, I'm not sure if they use those big crayons in your center to make you write PAL #'s on the packages. If so, I always found it easier to peel PAL labels and re-apply them to the outward-facing side as I walked into the trucks. It only works with the stickers and you might have to grow a fingernail a millimeter or two longer than you're used to, but it makes the job a piece of cake so long as you don't have 3-4 trucks that get absolutely destroyed day in and day out.