I found in the gloss on Tanya, Iggeret HaKodesh, Epistle 12:
"When Chesed does not insist (so to speak) on an unlimited revelation of kindness (but is satisfied to reveal the G‑dly illumination in a finite manner), and Gevurah insists only on witholding the revelation from those who are unworthy of receiving it (but does not insist on blocking the revelation altogether, even from the worthy — then the mediating attribute of mercy, which leans toward kindness, declares that while a particular recipient may not be strictly worthy of the kindness to be shown, he is at least worthy of being granted it out of compassion."
As is known, all the sefirot in the yosher structure manifest on three columns. The right kav is chesed, the left is din, and the middle is rachamim.
I did some research and found in Tomer Deborah, p. 9 I believe, that rachamim leans toward chesed. Some more research yielded that keter also inclines towards the right with yesod and malchut to the left or din. Reishit Chochmah, based on the five chassadim and gevurot.
However, I can't find any source which side daat leans toward. Does the two sides lean equally both ways like the two sides of tiferet for the Kohen and the Levi?