You are only getting a 4 if you are friends with your TM, or have done something unique that stood out too much to ignore, and even then its probably getting ignored if you are not friends on a personal level with your manager.
There is a LOT of disinformation on reviews and distribution of ratings. Most will say the department are only allowed X number of 4's and 5's, but then others managers who swear there is no cap on who gets a higher rating. In all the years ive worked here ive heard something different from every manager ive had, and i get a new one every 4-8 months.
Either way, its mostly about how well friends you are with your manager, your managers social standing among the other TMs, ive seen it turn into a cat fight over whos pet deserves that 4 with the dominant TM winning always like its some nature channel thing.
One thing is certain, you cannot expect to sit here, do well on your own, and expect a proper earned reward for going above and beyond. Ive never seen a TM just notice a quiet producer and then give them a good rating based on the work they do. No. They want you decorating the TMs desk, giving pointless speeches in huddles, or doing the TMs work for them to get that good rating. You are almost worse off working hard for the rating and getting it via metrics and quality work.
Oh and when you do get that 4 rating, or 5 even, be shocked as how un-impactful it is to your bottom end. Its just not worth the couple bucks extra, and likely you will miss a salary compression raise down the road because of it....so it never really mattered to begin with.
Just lay low and stay under the radar. Youll have better promotional oppertunities. Promotions make you the money, ratings never will unless you stay in express for 25 years maybe then they will add up.