How did you "load" those books your Kindle?
1) transfer via USB cable
2) wireless delivery using "send to email" or "Send to Kindle" apps/extensions?
Check if those books (file copies on the Kindle itself, obviously) with MobiMetaEditor have "cdeType" value as EBOK or PDOC. And also that "ttsflag" you already mentioned.
If the value is PDOC try changing them to EBOK and transfer them to your Kindle via USB cable (prior to that remove the exist file for the same book from your Kindle) and then test TTS functionality.
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