I have had a P1S for a little over a year now and found a number of things it really needs. I dislike modding printers but sometimes the original design is bad and needs help.
PRINT an ams buffer tool! You will need this and you cannot service it with out one. there are a lot of models for this.
I would recommend a top glass riser with vents and light. It eliminates the need to open the top (my AMS was on top and opening the top glass for plastic is a nightmare.) I walk past the door and leaving it open was just asking for unclejessing it. the light addition makes it so much better to see.
Add a high flow nozzle. My bambu could not make glossy prints unless you slow it down 50% the nozzle is just barely able to keep up. A drop in replacement like E3D or diamondback solves this. (I use the E3D).
AMS its a nightmare to use other manufacturers filament. If you plan on only using Bambu esun filament ignore this. I don’t love the bambu filament its ok no issues but its expensive for its quality. There are filament I thing print just as well for less money and ones that print better for the same.
I am in process of a full python change to the AMS. I am hopeful this will stop motor issues, over heating, miss feeds, jams I have had for most prints. The AMS is a mess or at least mine is.
That is my suggestions for Bambu fixes. These solved my repair, heat creep, print issues, and I am hoping all the feed issues.
I really wish Bambu would respond and fix the design. The buffer tube is silly, and no vents that can be opened or closed is not a hard fix. Hot end I get. AMS also as much as I hate the walled garden. They are close to the best machine but they just get in their own way, if it was easier to work on and a few daft ideas corrected.