I just saw a thread in this forum from 2014 / 2016 with the topic
"Size of OCRed Files" viewtopic.php?f=42&t=21670
It looks like it is the same problem as mine.
In 2016 you promise a solution ... but it seems that you nothing fixed in 2 years.
Could you please put the neccassary code in the dll to join the original pdf with the text layer like you mentioned ?
Then we are all satified. And I would like happy to be your Beta-Tester for that.