In case you didn't see this: when you go from LR to PS and back using file-save and you have LR to use zip compression when you bring the TIFF file back, the compression doesn't happen. You have to use file save as and specify zip compression in the dialog. the difference in the resulting file size can be very large.

https://petapixel.com/2020/04/13/thi...storage-space/

When I saw this, I did some reading on LZW compression, which is the other choice (and is often used in Linux). It turns out that photos are not handled well by LZW and that it compresses less. Apparently, it can even increase file size in some cases.