Thank you! I've been following your Twitter feed for a while and having all this in a single ebook is amazing.
I don't have any of the extended filters, but it is a small size reduction with the default load:
$ ./pdfsizeopt next-level-database-techniques-for-developers.pdf
...
info: generated object stream of 7399 bytes in 224 objects (9%)
info: generated 387518 bytes (89%)
$ stat -c '%s %n' next*.pdf
435483 next-level-database-techniques-for-developers.pdf
387518 next-level-database-techniques-for-developers.pso.pdf