I was looking at the books you uploaded. There isn't any obvious difference in the css 6.44 sets vs. what 7.4 set. The only difference I could see was that 7.4 additionally set the left and right padding to 0 on the <body> tag. I don't think that should contribute to the problem, but you could play with it and see.
The easiest solution is probably what you found - you can add -webkit-hyphens:none using Calibre's extra css option.
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