Hello!
Get this issue in 8.1.0, upgraded to 8.2.1, but it still happens.
Full situation as I done some digging:
scan from HP M725 LaserJet Enterprise MFP to PDF (1.4) or PDF/A format as image (not-searchable) one page with text is like 80 kb size.
Saving from PDF24 Creator with default parameters or with PDF24 Compress results in 213 kb file with same quality.
Changing quality results in smaller files with bad image quality.
I'll send sample files with parameters I've used to email forum@pdf24.org from my work address in next half hour.