Still looking for a solution to this. Tried copying "Logan", using Main Movie. Shows file size 29.951 GB, to be compressed to 22.461 GB. Actual file size was 14.1 GB. Tried changing the BD25 writable media size to 23098 and 23866, thinking it might use a different compression means, but it made no difference. Even tried copying the full video to the HD, using BD50 mode (which worked BTW), then used that file to try to convert to BD25. Still came out to 14 GB.
I tried disabling the GPU codecs to software, which resulted in an estimated copy time of 5 hours. Didn't matter anyways, because it caused my computer to freeze up solid after 3%. Reboot time..... Even tried using version 9, but it didn't recognize the new video card and froze up again around 3% again. Reboot again.....
Any idea on how to resolve this? At this point, I'm stuck making sub-par video copies, which kinda defeats the purpose of this software.