I use vocal harmony and it is, as far as I can hear, exactly the same in T5 and Genos. But the difference could be because Genos has new reverbs. Some of the new reverbs is pretty heavy in the lower frequencies. I noticed that these reverbs level up the feed back in the frequencies, where Genos detect the voice for generate the harmonies. And then Genos generate harmonies out of harmonies, and this gives a bad sound.
Try to lower down the low frequencies in the reverb or choose another one - fx. "Voice Hall 2".
Don't know if this is your problem, but try it out.
Best regard
Flemming