In Acrobat>File>Properties>Fonts do you see any Type 1 (CID) Subset? I remember some printers having trouble when those are present. If you are using Arial, try it without ligatures and see if that helps.

You can try this other option as well: https://wordmark.it/

What version of Indesign CS6 do you have. I’m testing on Windows 8.1 Indesign CS6 8.1

Check here: https://creativepro.com/test-font-choices-quickly-indesign-cc.php

Make a copy of the epub and try this. Change img._idGenObjectAttribute-1 from height:100% to height:auto, and get rid of min-width:100% and width:100%. In my test, this gets rid of the distortion in Kindle but you have to check the effect on other readers. Let us know.

I always create two files. One for print, one for ebook. Mainly because there’s some tweaking needed to prepare the file for ebook. My 2c.

I have done several books with CreateSpace here in US. I don’t have a problem reaching someone on the phone. There’s a “Call me” feature in their “Contact us” section. It will be interesting to see if printing the book in US (as far as I know they have facilities in North Carolina) will make a difference in Tom’s case.

I’ve used it when I want to print certain pages or page ranges. No problem at all.