I have to post this because I was going to write off the Tral. 1 plus 2. I just received my Silver Dragon cable that I had reterminated with the balanced connector that fits the HIFIMAN 901. I like the sound much better. It is fuller and not as lean, compared to the silver gold cable that came with the 1 plus 2. This headphone is very cable sensitive. It may be that the 901 sounds better balanced.
I wasn't too sure the change from SE cable on balanced amp to balanced cable on balanced amp would be a night and day difference.... but either way glad you find a combo that works for you :)