Great write up OP. I admire your effort and out-of-the-box thinking.
Reading this thread and all the comments, i think it's being blown out of proportion. Genuine bracelets are better fitted because of the screws/screw holes being better quality and better machined than the reps. If you shine a light and take a loop you can see a shit ton of debris and dirtiness inside the screw holes of the bracelets on the reps. It's because most of these parts that are put together are kept in places where hygiene and cleanliness are non-existant. The parts are probably kept stacked on one another in a box somewhere in the open, and dirt/particles gather. The parts are also more than likely not cleaned thoroughly after they're machined, which makes it a nightmare when put together.
The vacuum and grease is all fine. If you want to do that method it more than likely works as the OP confirmed. However, that seems a little bit like overkill to me. I've too been obsessing over the feel of the rep bracelets ever since owning genuine Oysters and Jubilees. I've tried everything from WD40 (don't judge) to J&J Baby Oil to Mobil 1 fully synthetic 5W-10 motor oil. They all worked great for about 2-3 weeks until dirt got inside and glued to the oil, or until it dried up.
I don't want to derail this thread, but a solution i've been using on every single rep bracelet has worked wonders, and all it costs is about $9.40. Most oils stay wet and that attracts dirt & dust & debris over time. Some oils will dry out as well due to your body heat and environment. One day while in my garage I came upon some dry lube that I used for my motorcycle chains. It wasn't made for jewelry and might've been even a little bit harsh with it's chemicals inside, but I decided to use it anyways. It worked for a few days. So I decided to go online and search up some dry lube oils. I came across "Muc-off" dry lube (it's not 100% dry, it's "damp", so in between dry and wet).
Bought a small bottle to test on a brand new VSF Rep which also sounded and felt like complete shit when it arrived. Used the lube and to this day (1 year & 7 months later) it still feels the same. I will be re-lubing it just for the sake of keeping it the best condition possible. Here is what I do:
-take apart every single removable part on the bracelet (remove all screws)
-use dish soap (i use Dawn Dish soap, the apple scent because I like the way it smells) and wash the parts under hot water. Once I clean the outside of the parts, I then pour a good amount on the part and move it around so that the dishsoap seeps into the cracks. Wash it all off and use a microfiber towel to dry.
-place the screws, and all the bracelet parts inside of a plastic or glass tupperware container with isopropyl alcohol. Let it sit for about 10 minutes. Try moving the parts around one by one so that the isopropyl alcohol gets into all the cracks and crevices.
-next place all of the parts into a small plastic or glass container and pour in the dry lube. I like to keep mine sitting for 24 hours but you don't really have to. The dry lube is super thin, so it won't take a lot of time. I like to swoosh the dry lube around in the container every hour or so, so it works its way into all the places it needs to go into.
-I then take out the parts and put them one by one into a plastic ziplock bag. I pour in the dry lube from the container and close the baggy up. I put the bracelet together (just the actual bracelet bits, with the screws) and then move the bracelet back and forth mimicking the movement it would make if I were wearing it. This is the important part so that it sits properly.
-Once I do that to all parts, I then only wash the bracelet off with warm water quickly and wipe it down. That's it.
You can try it for your self. $10 for the bottle is nothing, and should make your bracelet feel like the real deal for a year or more like mine have. I've done this to Oyster and Jubilee bracelets, and it's the same outcome everytime. It's amazing and the effort shows when it's done. I am doing the treatment on my VSF Starbucks that just came in today. Hope this helps, and if anyone has any questions feel free to reach out.
(Again - not to derail OP's thread, but wanted to add in the method I use. If my method doesn't work, definitely try OP's).