Guess I'm out of luck, since both games with this engine, and most games I have this problem with, which aren't that many, are niche h-games. No h-code to be found from searching and the thread I have checked as dialog is the only one picking up the data. As you can see from the sceenshot, it's picking up all the text, no problem, it's just got that bit of junk at the front that tosses the translation up sometimes.
The only other real annoyance I have sometimes is sentence or character repetition, but I've have to check which games that applies to.