Acrobat Metadata - importing Description data only to keep small pdf size for uploading to website?

Hi folks, we need to add metadata to our pds before they are uploaded to a website. These document are exported from InDesign where we add the metadata for Document Name, Author, Keywords and just need to have this showing in the final PDF. However, before uploading to the website we have to compress these pdfs to under 1MB and doing this results in losing the metadata, so we have to go back and add it in again manually. We tried to Export the metadata from InDesign to save copying and pasting it in again manually, but the exported data is huge and makes the compressed file, back to its original file size, so this doesnt work. Is there any way (a script for example) for just exporting the little bit of data we need to add in the basic document properties only ie as above Doc title, Author, Keywords. We have hundreds of different documents that we have to add each documents metadata too manually and would love to find a quick simple way of doing this each time. I have also tried all kinds of compression methods to try and keep the metadata when compressing the pdf, but it seems the metadata is the thing that makes the pdfs so large, so I cant manage to compress them and keep the metadata. Any help would be very much appreciated. Cheers Gia