There is no write strategy for that media code in the burners firmware. So it's just using a generic write strategy and that seems to not work to well.
Either get a burner that supports that new media code or get some more generic discs like Verbatim.
The oversizing of the game is in a kind a copy protection measure and discussing how to overcome that is not really legal in this forums home country.
Suggest that you Bing it on game forums for this task.
Sounds as the "box" SATA --> USB that is the issue. Some USB equipment just go grazy and report that semaphore error.
No chance you can connect it directly USB --> USB?
The last time I had the issue was with ver 1.56 and after that never had SPTD installed. Also only DVD -R media was affected.
Tried with the latest 1.81 version and no speed limit issue. Seems they fixed the problem.
You can't have ImgBurn to "span" it to two discs. You need to do that split in another program. What's in the ISO?
Depending on what's in the ISO, you could mount it and do two new builds to ISO in ImgBurn.